Lagoona Blue is recognized by a handful of details rather than one outfit: blonde hair streaked with blue, fins at the forearms and calves, freckled sea-creature skin and a sporty, beachy wardrobe. Get those right and the clothes underneath can be almost anything in turquoise, coral and black. I treat her as a styling job first and a sewing job second, because most of her looks come together from pieces you can buy or thrift and then customize. Below are 30 versions, from her early doll outfits and the pink-skinned update to swimwear, sleepwear and an original mermaid gown, with notes on what makes each one hold up through a long Halloween night or a full convention day.
Fins That Bend Instead of Snapping
Fins are what separate Lagoona from any blonde in a turquoise hoodie, and they're also the piece most likely to fail. Stiff cardboard or thick foam fins dig into your arm, catch in doorways and crack the first time you sit down. I make mine from thin craft foam or a double layer of stiff felt, so they flex and spring back.
- Draw one fin on paper and hold it against your forearm in a mirror before cutting. It should run from just below the elbow toward the wrist without covering the joint.
- Cut two layers and glue them together around the elastic loop, so the elastic is sandwiched inside rather than glued to the surface, where it peels away.
- Press the rib lines in with a dull pencil, then dry-brush a darker teal into the grooves so they read as fin spines from across a room.
- Use flat elastic about a finger wide. Thin cord elastic rolls, pinches and leaves marks.
- Make a spare pair. Fins get stepped on, sat on and borrowed by friends.
For the see-through fins on the glam versions, iridescent craft film or clear vinyl gives the right shine, but the cut edges are sharp. Round every corner with scissors and run a fingertip along each edge before you wear them.
Blue Skin That Stays Off Your Collar
Most of these looks ask for blue or pink skin, and body makeup is where an otherwise good costume goes wrong. Patch-test any face or body paint on the inside of your wrist the day before, since a reaction is far better discovered at home. Water-activated cake paint is the most comfortable over large areas. Cream paint gives stronger color on the face, but it creases and transfers on a warm night.
My order is simple: clean, dry skin, thin layers of paint applied with a damp sponge, then a generous press of translucent setting powder. I paint about a finger's width past every neckline and cuff so bare skin doesn't peek out when you move, and I let it dry completely before any fabric touches it. Black clothing hides transfer far better than white collars. To take it off, use a gentle cleanser or an oil-based remover with warm water instead of hard scrubbing, and keep a few wipes in your bag for touch-ups during the night.
1. Classic Lagoona Blue Cosplay
The first-generation outfit is the one most fans picture, so it's where I'd start if you want strangers to name the character without a hint. A pink scale-print tank or fitted bodysuit goes under a cropped turquoise hoodie with black trim, then black shorts, turquoise fishnets and black-and-white platform sandals. The wig is long and blonde with loose curls and bright blue streaks. On the face, a pale blue base, purple shadow, pink lips, blue freckles and a few painted scales at the temples. Foam fins on elastic sit near the elbows and calves; put the calf elastic below the widest part of the leg or it slides down by the second hour. Gold sea-themed jewelry, a pink flower clip and a clear fishbowl-style purse with a small toy fish finish it, and that purse is the detail fans look for.
2. Generation 3 Lagoona Blue Cosplay
The Generation 3 Lagoona trades blue skin for bright pink and dresses in athletic gear. A rainbow tie-dye bike-short romper, a cropped hot pink hoodie with mesh sleeves, chunky color-block platforms and a sea-creature waist bag give you the shape. Pink face makeup with turquoise body paint blended from the knee down copies her two-tone legs. I blend that line with a damp sponge rather than a brush so it fades instead of stopping in a hard stripe. The wig is wavy blonde with blue, pink and purple streaks, and pearl-like freckles, coral gloss, iridescent eyes, small pastel fins on the calves and hood, starfish earrings, translucent sunglasses, a shell backpack and a toy piranha companion carry the rest. Leg paint rubs off on car seats, so let it dry fully and set it before you sit anywhere.
3. Lagoona Blue Animated Series Cosplay
Her animated-series wardrobe is loud on color but easy to wear, which is why I like it for a long day on your feet. A rainbow-gradient hoodie in yellow, pink, purple and turquoise goes over distressed denim shorts with black fishnet bike shorts beneath. Blue platform sandals get pink foam tentacles on the straps; use a flexible fabric glue or contact cement there, because hot glue on a strap pops off the first time the strap bends. A small red waist bag with tooth details keeps your hands free. The long blonde wig has turquoise and pink sections in beach waves, paired with pink makeup on the face and arms, metallic blue webbing on the hands, soft blue freckles, mismatched aquatic earrings, removable calf fins and a seashell-shaped phone prop.
4. Lagoona Blue School’s Out Cosplay
This is the dressier school look, and it suits anyone who doesn't want to paint much leg. A fitted black top with turquoise mesh sleeves, a short teal skirt printed with bubbles or scales, cropped black leggings and aqua ankle-strap platforms make the outfit. Give the blonde-and-blue wig a deep side part and a smooth crown. Inexpensive wigs tend to puff at the crown, so I flatten it with a few bobby pins and a light mist of hairspray, and I only use a curling iron on the ends if the wig is labeled heat-resistant. Pale blue body makeup, lavender shadow, defined lashes and pink lipstick keep the face bright. Pearl necklaces, shell earrings, translucent fin cuffs, a structured turquoise handbag, a decorated notebook and a black headband with a coral-pink flower finish her.
5. Lagoona Blue Dawn Of The Dance Cosplay
The dance look is for a party where you'll be photographed more than you'll walk. A fitted turquoise striped dress with a flared mermaid hem and sheer pink ruffles, a metallic gold sash fastened with a shell brooch, and transparent pink heels or jelly platforms set the tone. The hair is the hard part: the blonde-and-blue wig becomes a faux mohawk that flows down the back. I build it by teasing the center strip, pinning the sides flat against the head and spraying in stages, because one heavy coat of spray just weighs the hair down. Blue face and body makeup, deep teal shadow, glossy teal lipstick and light scale patterns go with pearl drop earrings, a bubble necklace, a gold arm cuff, fins and a small shell-shaped evening purse.
6. Lagoona Blue Skull Shores Cosplay
Skull Shores is Lagoona on vacation, and it's the easiest version to build from summer clothes you already own. Start with a black halter swimsuit or tank striped thinly in pink and turquoise, then add fitted shorts, a pink scale-print sarong and a translucent blue cover-up that moves when you walk. Ocean-blue platforms with bubble or wave trim keep it playful, and a pink tropical flower pinned near one ear finishes the hair. Light blue body makeup, turquoise shadow, coral lips and small scales under the eyes handle the face, while mismatched octopus earrings and a tentacle bracelet add humor. Removable fins, big sunglasses, a beach bag and a smoothie cup prop round it out. Honest warning: this one is cold at an October party, so pick a cover-up you can actually close.
7. Lagoona Blue Gloom Beach Cosplay
A sporty one-piece makes Gloom Beach simple and very wearable. Look for a turquoise swimsuit with black panels, pink piping and a scale-print center, then add a sheer black wrap skirt or short mesh cover-up and turquoise wedges. A relaxed high ponytail stays tidier than loose waves when you're moving around. Water-based makeup gives the classic blue skin, with purple liner, coral lips and tiny turquoise freckles. Water-based paint reactivates with sweat, so I set it with translucent powder and blot rather than wipe if I get warm. Foam fins on the forearms and calves are what turn a swimsuit into a character, and shell earrings, stacked bracelets, a striped beach tote, sunglasses and a bottle covered in bubble and sea-creature stickers do the rest.
8. Lagoona Blue Dead Tired Cosplay
Her sleepwear look is the one I'd pick if comfort matters more than anything. An off-the-shoulder black pajama top trimmed in hot pink and turquoise goes with loose aqua lounge pants printed with bubbles, fish or scales. Teal piranha slippers are funny indoors, but slippers have thin soles and no grip, so switch to decorated slip-on sneakers for anything outside. A low side braid survives a night on the sofa better than loose waves. Pale blue face makeup, soft lavender shadow, pink gloss and light scale accents keep it gentle. A turquoise sleep mask pushed up on the forehead, light fin cuffs, a mug of faux marshmallows, a shell-print pillow and a small toy fish make the joke clear.
9. Lagoona Blue Mad Science Cosplay
Mad Science mixes her sea style with a classroom lab, and the lab coat does most of the storytelling. Wear a sleeveless turquoise bubble-print dress under a fitted white lab coat with rolled sleeves, black trim at the waist and teal platform heels with yellow ankle straps. A white coat shows blue makeup on the collar and cuffs within minutes, so I paint only the face, front of the neck and hands, set them well, and leave a small bare gap under the collar. One side of the wavy wig is braided back under pink clips. Teal shadow, coral lips and cheek scales sit on the blue base, with soft fins at the elbows and lower legs, yellow anchor earrings, a pink necklace and costume goggles. A plastic beaker of blue cellophane, a science notebook and a toy three-eyed frog are the props.
10. Lagoona Blue Picture Day Cosplay
Picture Day is about looking neat from every angle, so fit matters more than extras here. Tuck a bubble-print turquoise blouse with short puff sleeves into a black pleated mini, add patterned blue tights and teal platform Mary Janes, and cinch it with a coral belt that ties the pink accessories together. Curl the wig smoothly and pin one side back with pearl clips. Blue body makeup, lavender shadow, defined lashes, glossy pink lips and delicate scale freckles make the face. Fin cuffs should lie flat against the arms and calves; if they flip outward, a strip of double-sided fashion tape under each one holds them down. Shell earrings, stacked bracelets, a turquoise book bag and a portrait-folder prop finish the school theme.
11. Lagoona Blue Dance Class Cosplay
Dance Class is the one to choose if you'll be moving a lot. A fitted teal leotard printed with pink coral, bubbles or seaweed goes over black dance leggings or fishnets, with a sheer turquoise skirt wrapped at the hips, and ballet flats, jazz shoes or low dance sneakers replace heels. Pull the wig into a high ponytail with two wavy pieces left at the face. A ponytail on a wig needs a wig grip or a row of pins underneath, or the weight drags the hairline back. Pale blue body makeup, waterproof purple eye makeup, pink lipstick and cheekbone scales hold up to a warm evening better than heavy cream paint. Removable fins, pearl earrings, coral wrist warmers, a ribbon-wrapped dance bag and a shell-decorated water bottle finish it.
12. Lagoona Blue Roller Maze Cosplay
Roller Maze turns her into a retro skater. A turquoise athletic tank with black scale patterns, black shorts trimmed in hot pink, striped knee socks, elbow pads and bright blue skates with pink laces give the basic shape. Plenty of venues don't allow skates, so check first and bring platform sneakers, carrying clean skates as a prop. Keep the wig in a high ponytail well away from your face; loose hair in your eyes on wheels is a fall waiting to happen. Blue body makeup, bold pink lipstick, turquoise shadow and sporty face stripes keep it lively. I attach the fins underneath the elbow pads so the pads hold them in place, then add a helmet, shell earrings, wrist guards and a numbered team badge.
13. Lagoona Blue Dot Dead Gorgeous Cosplay
A polka-dot party dress gives this version a retro silhouette. Find a fitted turquoise mini covered in black dots, bubbles or small scale motifs, ideally with a flared skirt, pink waistband and sheer ruffles at the neckline, then add patterned tights and glossy teal platforms. If you can't find dotted fabric, dots stamped with a round foam dauber and fabric paint look far tidier than freehand ones. Curl the wig and sweep it to one side under a coral flower clip. Smoky aqua shadow and bright pink lipstick sit on a blue base with shimmering scales at the temples. Translucent fin cuffs, pearl earrings, layered bubble necklaces, a shell-trimmed clutch, a pink bracelet stack and a compact mirror prop finish this party version.
14. Lagoona Blue 13 Wishes Cosplay
Rich jewel colors give 13 Wishes a dreamy feel without anything frightening, which makes it a good pick for a younger crowd. A turquoise dress with a fitted bodice, gold scale accents and sheer purple layers on the skirt, a metallic pink belt and teal platforms with gold straps form the base. Style the wig in polished curls under a delicate gold head chain. Head chains slide on synthetic hair, so I anchor each side with a small clear elastic or a bobby pin. Purple-and-gold shadow, coral lipstick and soft scales along the cheeks and collarbones go over pale blue skin. Translucent fins cut from iridescent craft film, shell earrings, gold cuffs, a jewel-toned purse and a bottle of glittery cellophane as a light prop finish it.
15. Lagoona Blue Ghoul’s Night Out Cosplay
For an evening out, put her in a fitted aqua cocktail dress with black mesh panels and coral-pink piping. A short bubble hem or ruffle skirt keeps the playful energy, and black fishnets with turquoise ankle-strap platforms suit the shape. A voluminous side ponytail or brushed-out waves both suit the wig. Classic blue body paint pairs well with deep turquoise shadow, long lashes, glossy pink lips and pearl-like freckles. Mesh panels are where uneven paint shows most, so I paint the skin that sits under them first and let it dry before dressing. Translucent fins, mismatched aquatic earrings, bubble bracelets, a small fishbowl purse, a shell compact and a cropped black jacket make it dressy while still clearly Lagoona.
16. Lagoona Blue Swim Class Cosplay
Swim Class should look like a team uniform, not just a swimsuit. A sporty turquoise one-piece with black side panels, pink straps and a subtle scale pattern goes under a cropped mesh jacket, with aqua bike shorts if you want more coverage. A secure braided ponytail and colorful goggles pushed up on the head finish the hair. Pale blue makeup, purple liner, pink lip stain and small forehead scales go on next, with fin cuffs, shell studs and a wristband. The props carry the theme: a turquoise duffel, a rolled towel and a decorated kickboard. Striped pool slides look right, but they're noisy and slippery on hard floors, so I'd keep them for photos and walk around in platform sandals or water shoes.
17. Lagoona Blue Black Carpet Cosplay
The Black Carpet gown is her red-carpet look in turquoise, black and shimmering coral. Look for a fitted high-low dress with sheer scale-print sleeves and cascading ruffles that read as waves, and let metallic blue heels show under the shorter front. Glossy waves on the blonde-and-blue wig suit the formality. Turquoise shadow, pearl highlighter, coral lips and tiny rhinestone-like scales over blue skin give a luminous finish. Stick-on gems need a skin-safe adhesive such as eyelash glue, never craft glue. Transparent fins on the forearms and calves, long shell earrings, a bubble necklace and a structured coral clutch go with it, and a faux event pass or a small camera-friendly purse is a practical touch at a convention.
18. Lagoona Blue Great Scarrier Reef Cosplay
This full sea-creature version, named for her home reef, takes the most making. A fitted turquoise jumpsuit or mermaid-cut dress printed with coral, bubbles and tropical fish gets sheer fin-shaped panels added at the hips and lower legs. I cut those panels from chiffon or organza and seal the edges with fray-stopping liquid or a narrow rolled hem, since polyester sheers fray almost as soon as they're cut. Iridescent platforms add height without hiding detail, and long waves with small braids and pastel shell clips suit the wig. Blue makeup on exposed skin, purple shadow, pink lips, pearl freckles, luminous scales, larger translucent arm fins, coral earrings, a sea-flower crown and a clear purse of faux pearls and sea plants finish it.
19. Lagoona Blue Shriekwrecked Cosplay
Sailor details make Shriekwrecked one of her cheeriest outfits. A striped turquoise-and-white top goes under a short coral jacket with gold buttons, then black sailor shorts, patterned aqua tights and blue platform ankle boots. A light sailor cap trimmed with a pink shell replaces a traditional emblem; a thin elastic under the wig holds a cap far better than pins alone. Windblown waves or a low side ponytail both suit the hair. Blue body paint, turquoise liner, rosy lipstick and scale freckles across the nose handle the face. Soft, flexible fins on the arms and calves, anchor earrings, rope bracelets, a striped crossbody, a rolled map and a small toy telescope make an easy, family-friendly set of props.
20. Lagoona Blue Welcome To Monster High Cosplay
This party dress captures her school-dance energy. A turquoise fit-and-flare with coral patterns, a pink waistband and sheer aqua layers goes with black fishnets and teal platform pumps or ankle-strap sandals. Springy curls are pinned behind a shell clip on one side. Shimmery lavender shadow, defined lashes, coral-pink lips and scales at the outer corners of the eyes sit on blue body makeup, and fin cuffs keep the sea-monster idea clear without overwhelming a pretty dress. Bubble necklaces, pearl earrings, pink bracelets, a transparent purse, a dance invitation and a wrist corsage finish it. I'd skip a real flower corsage; a silk one won't wilt or leave damp marks on the paint.
21. Lagoona Blue Haunt Couture Cosplay
Haunt Couture pushes her original outfit toward runway styling. A sparkling coral bodysuit goes under a structured turquoise jacket with black mesh sleeves and fin-shaped shoulder details, plus fitted black shorts, aqua fishnets and dramatic black-and-white platforms. The shoulder fins are the tricky part: back them with stiff felt or thin EVA foam so they stand up instead of folding over by mid-afternoon. Brushed waves with tiny braids at the temples suit the wig. Pale blue body makeup, purple shadow, luminous scales, defined lashes and deep coral lips make a glamorous face. Gold seahorse jewelry with pearls, translucent bracelets, larger iridescent fins and a pink fish-tank purse holding a skeletal toy fish finish it. Keep every accessory light, because hours of convention wear make heavy jewelry feel twice its weight.
22. Lagoona Blue Fan-Sea Cosplay
Fan-Sea drifts like a jellyfish, so the fabric has to move. A shimmery turquoise high-low dress with pink jellyfish print and sheer bell sleeves goes with iridescent platforms that show under the shorter front. Long, smooth waves with pearl pins and small translucent ribbons suit the wig. Pink or blue skin both work depending on which generation you love, topped with aqua shadow, glossy coral lips, luminous freckles and painted scales, and flexible fins sit at the forearms and calves. Shell drop earrings, a pearl choker, layered bracelets, a transparent sea-themed handbag and a small decorative fan finish it. Bell sleeves catch on doorframes and drinks, so if this is going to a crowded party, I'd hem them a little shorter than looks right on the hanger.
23. Lagoona Blue Fearidescent Cosplay
Fearidescent is her wintery pastel look, and it's the most practical choice for a cold night outside. A fitted turquoise mini dress or romper goes under a translucent lavender jacket with an iridescent finish, plus shimmering blue tights, thick pastel leg warmers and silver shell-trimmed platform boots. Icy blue and soft pink streaks run through the blonde wig under a fuzzy aqua bucket hat, which also hides a messy wig-cap line. Pink face makeup with a blue gradient on the hands and lower legs, lavender shadow, pearly highlighter, glossy lips and glitter-free painted scales make the face. Glitter-free is a smart call; loose glitter turns up on everything you own for weeks. Translucent fins over the sleeves and boots, a shell purse, pearl earrings, reflective sunglasses and a pastel scarf finish it.
24. Lagoona Blue Spa Day Cosplay
Spa Day is about as comfortable as cosplay gets. A turquoise romper goes under a light coral robe printed with bubbles, seaweed or shells, with aqua leggings for coverage and plush fish slippers or pastel platform slides. A loose topknot with wavy strands at the face suits the wig. Keep the blue or pink skin sheer, then add turquoise under-eye patches, glossy lips, pearl freckles and subtle scales. Choose small fin cuffs that sit under the robe sleeves rather than catching on them. A shell headband, a bright manicure, a rolled towel, a clear cosmetic bag and a sea-creature cup carry the joke. I suggest this one to anyone who dislikes heavy makeup, since a sheer base takes minutes instead of an hour.
25. Lagoona Blue Monster Fest Cosplay
Festival styling gives Lagoona plenty of texture and movement. A fitted coral crop top with scale details goes over a layered turquoise skirt with fringe, sheer panels and iridescent accents, with patterned bike shorts underneath and chunky blue platform boots. Braid sections of the wig and decorate them with pearls, ribbons and tiny shell clips; braiding tames synthetic frizz far better than brushing does. Pink skin makeup with turquoise shading on the legs, bold blue shadow, glossy coral lips and luminous scales make the face. Transparent fins on the arms and calves, oversized shell earrings, stacked bracelets, a hands-free fish bag, sunglasses and an event wristband round it out.
26. Lagoona Blue Scare-Adise Island Cosplay
Scare-Adise Island uses tropical pieces that suit a warm day or an indoor party. A turquoise scale-print swimsuit goes under a loose coral button-front shirt tied at the waist, plus black shorts, a sheer blue sarong and comfortable aqua platforms. A high ponytail with a tropical flower and shell barrette keeps the wig off your neck. Pink skin with blue shading below the knees fits the later dolls, or use classic blue for a first-generation look, with aqua liner, coral lips, pearl freckles and removable fins. A shell necklace, bright sunglasses, a woven tote, a reusable tropical cup and a small toy fish tucked into the bag are the props. The tied shirt is also your warmth plan: untie it and button up when the evening cools.
27. Lagoona Blue Core Refresh Cosplay
Core Refresh is a modern school wardrobe with stronger ocean details. A fitted turquoise top with a scale-print neckline goes under a cropped coral mesh jacket, then high-waisted black shorts with aqua side panels, patterned fishnets and chunky turquoise platform sneakers. Thick waves with blue and pink streaks framing the face suit the wig. Pink skin, blue blended over the lower legs, luminous cheek freckles, purple liner, coral gloss and subtle forehead scales make the face. Fin cuffs, shell hoops, bead bracelets, a structured seashell backpack, a fish waist bag, bright headphones and a decorated notebook finish it. I'd build this one around the sneakers, because they're the piece you'll wear again long after Halloween.
28. Lagoona Blue Day Out Cosplay
Day Out suits daytime events, theme parks or a school-friendly costume day. A turquoise graphic tank goes under a cropped pink zip hoodie, with black denim shorts, aqua fishnets and blue platform sneakers you can walk in. A shoulder-length blonde wig with blue streaks tangles far less than waist-length hair and still says Lagoona at a glance. Light blue or pink face makeup, lavender shadow, coral gloss and a few painted scales at the temples are plenty. Small removable fins, shell earrings, sunglasses, a clear crossbody, a toy fish keychain and a sticker-covered water bottle finish the relaxed outfit.
29. Easy DIY Lagoona Blue Cosplay
This is the budget build, made from closet and craft-store pieces. Layer a turquoise zip hoodie over a pink tank, add black shorts and cheap blue fishnets, and wear black platforms, combat boots or sneakers with white striped ribbon across the front. Clip blue extensions into a blonde wig or your own blonde hair. Blue face paint, pink lipstick, purple shadow and dots of turquoise liner as scales make the face. Cut fins from flexible craft foam, paint them aqua and hold them on with clear elastic. Plain acrylic cracks on foam that bends, so I mix in a little fabric medium first. A pink flower clip, shell jewelry, a clear purse and a small toy fish finish it, and none of it costs much.
30. Glam Mermaid Lagoona Blue Cosplay
This original mermaid version leans hard into her underwater side. A fitted turquoise sequin top goes with a layered high-low skirt in aqua, coral and translucent blue, leggings underneath for coverage, and iridescent platforms or ankle boots. Large waves with pearl pins suit the wig. Pale blue body makeup, purple-and-coral shadow, glossy pink lips and a detailed scale pattern across the temples, shoulders and collarbones bring the glamour. The quickest way to get even scales is to stretch a piece of fishnet against the skin and sponge color through it. Keep the large transparent fins soft so they bend when you sit, and add shell earrings, a bubble necklace, pearl bracelets and a clear clutch of faux pearls and sea plants. Sequined tops can scratch the inner arm, so check the seams before you buy.
Taming a Blonde Wig With Blue Streaks
Her hair does as much work as the fins. Ready-made blonde-and-blue wigs exist, but you can also clip blue extension wefts into a plain blonde wig, which lets you choose where the streaks fall and reuse the wig for another character later. Put most of the blue at the front and through the lengths, since that's what shows in photos.
- Inexpensive synthetic wigs shed and frizz at the ends. Detangle with a wide-tooth comb, starting at the tips and working up.
- Unless the label says heat-resistant, keep curling irons and hair dryers well away; standard synthetic fiber kinks or melts.
- A light spritz of fabric softener diluted in water calms static and tangles on long fibers.
- Pin the wig to a wig cap at the temples and the nape so a high ponytail doesn't drag it backward.
If your own hair is already blonde, temporary color spray or clip-in streaks spare you from dyeing. Sprays can rub onto pale clothing, though, so test one on a hidden section and let it dry fully before you get dressed.
Lagoona Reads From Her Fins and Hair First
Every Lagoona on this list comes back to the same few signals: blonde hair with blue streaks, fins at the arms and legs, freckled scales and a turquoise-and-coral palette. Get those right and the rest is a matter of which era you love most. If you'll be in costume for hours, I'd spend the effort on flexible fins and walkable shoes before anything else, because those are what keep you smiling at the end of the night. Copy a doll release closely or mix several into your own version; either way, the fans in the room will know exactly who you are.
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