.math-arena{--blue:#00cfff;--pink:#f42bdb;--orange:#ff9a16;color:#eff7ff;min-height:100dvh;font-family:var(--font-display);isolation:isolate;background:#020615;position:relative;overflow:hidden}.arena-tunnel{z-index:-1;background:radial-gradient(ellipse at 50% 38%, #113784 0, transparent 40%), repeating-conic-gradient(from 20deg at 50% 40%, #001123 0 14deg, #02050f 15deg 28deg, #092754 29deg 30deg);position:fixed;inset:0;overflow:hidden}.arena-tunnel i{inset:calc(5% + var(--i) * 4%);clip-path:polygon(12% 0,88% 0,100% 18%,100% 82%,88% 100%,12% 100%,0 82%,0 18%);animation:5s linear infinite arena-drive;animation-delay:calc(var(--i) * -.55s);border:2px solid #00baff66;position:absolute;box-shadow:0 0 14px #007bff88,inset 0 0 20px #007bff55}.arena-floor{background:repeating-linear-gradient(90deg,#0000 0 79px,#0cf7 80px 82px),repeating-linear-gradient(0deg,#0000 0 79px,#dd21ff66 80px 82px);position:absolute;inset:60% -80% -80%;transform:perspective(350px)rotateX(55deg);box-shadow:0 -5px 60px #00d9ff88}.arena-shell{max-width:1050px;margin:auto;padding:18px 24px;position:relative}.math-arena nav{justify-content:space-between;align-items:center;gap:10px;font-size:12px;display:flex}.math-arena nav b{color:var(--orange)}.math-arena button{color:#ecf7ff;cursor:pointer;background:linear-gradient(#0a1831ee,#030817ee);border:1px solid #4b7fb3;border-radius:9px;justify-content:center;align-items:center;gap:8px;min-height:44px;padding:12px 22px;font-weight:700;display:inline-flex;box-shadow:inset 0 0 16px #0376ff22}.math-arena button:hover{border-color:var(--blue);box-shadow:0 0 20px #00baff55}.math-arena button:focus-visible,.math-arena input:focus-visible,.math-arena select:focus-visible{outline-offset:4px;outline:3px solid #fff}.math-arena .arena-primary{color:#fff;background:linear-gradient(#ffad19,#c14500);border:2px solid #ffc15a;box-shadow:0 0 12px #ff9a16,0 0 40px #ff650866}.arena-menu{text-align:center;padding:6vh 0}.arena-kicker{letter-spacing:.3em;color:var(--blue);font-size:11px}.arena-menu h1{letter-spacing:-.04em;text-shadow:0 3px #133088,0 0 25px #166bff;margin:25px 0;font-size:clamp(65px,10vw,115px);font-weight:900;line-height:.85;transform:skew(-5deg)}.arena-menu h1 em{color:#ffca48;text-shadow:0 0 16px #f60;font-size:.75em;line-height:1.25;display:block}.arena-menu p{line-height:1.6}.arena-start{width:min(380px,100%);margin:20px auto;font-size:24px}.arena-menu-buttons{flex-wrap:wrap;justify-content:center;gap:10px;margin:10px auto 20px;display:flex}.arena-panel{background:#030b20ee;border:1px solid #2f8ac9;border-radius:18px;max-width:700px;margin:8vh auto;padding:32px;box-shadow:0 0 40px #08f3}.arena-panel h2{text-shadow:0 0 16px #008cff;font-size:30px}.arena-panel p,.arena-panel li{color:#c1d7ec;line-height:1.8}.arena-panel button{margin:10px 10px 0 0}.arena-panel label{margin:20px 0;display:block}.arena-panel select{color:#fff;background:#091b35;border:1px solid #00baff;width:100%;padding:14px;display:block}.arena-toggle{background:#0c1934;justify-content:space-between;padding:15px;display:flex!important}.arena-toggle input{accent-color:#00baff;width:24px;height:24px}.arena-count{text-align:center;text-shadow:0 0 45px #0af;padding:20vh 0;font-size:clamp(90px,20vw,220px)}.arena-game{text-align:center;max-width:800px;margin:4vh auto}.arena-hud{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:12px;display:grid}.arena-hud>div,.arena-results>div{background:#02091bee;border:1px solid #244466;border-radius:10px;padding:12px;box-shadow:0 0 22px #004b8833}.math-arena small{letter-spacing:.08em;font-size:11px;display:block}.arena-hud strong{color:var(--blue);font-variant-numeric:tabular-nums;justify-content:center;align-items:center;font-size:36px;display:flex}.math-arena progress{width:100%;height:7px;accent-color:var(--blue)}.math-arena .arena-orange{color:#ffac2e;text-shadow:0 0 16px #f80}.math-arena .arena-green{color:#64ffb3;text-shadow:0 0 16px #00f77c}.math-arena .arena-red{color:#ff626f;text-shadow:0 0 16px #f03}.arena-equation{text-shadow:0 0 18px #1787ff;white-space:nowrap;background:#021027e8;border:2px solid #30caff;border-radius:14px;margin:30px auto 18px;padding:35px 12px;font-size:clamp(48px,8vw,88px);font-weight:800;box-shadow:0 0 15px #00acff,inset 0 0 28px #08f7}.arena-game>input{color:#fff;text-align:center;background:#020b1def;border:2px solid #29c2ff;border-radius:10px;width:100%;max-width:420px;margin:auto;padding:10px;font-size:38px;display:block;box-shadow:0 0 15px #08f6}.arena-game>input::placeholder{color:#a6c6e7;font-size:15px}.arena-instruction{color:#c1d7ec;font-size:13px}.arena-feedback{color:#bfefff;height:30px;font-weight:700}.arena-pad{grid-template-columns:repeat(3,1fr);gap:7px;max-width:420px;margin:5px auto;display:grid}.arena-pad button{min-height:48px;padding:9px;font-size:23px}.arena-game .arena-exit{min-height:36px;margin-top:12px;padding:8px;font-size:11px}.arena-hit{border-color:#53ff9f;box-shadow:0 0 40px #00ff9366}.arena-miss{border-color:#ff295b;box-shadow:0 0 40px #ff003b66}.arena-results{text-align:center;grid-template-columns:repeat(3,1fr);gap:12px;display:grid}.arena-results strong{font-size:54px}.arena-result{text-align:center}.arena-result h3{color:#ffbc46;text-shadow:0 0 15px #ff8500}.arena-record{color:#5bffbe;text-shadow:0 0 25px #0f9;font-size:90px}.arena-storage{text-align:center;color:#ffd27e;font-size:12px}@keyframes arena-drive{0%{opacity:.1;transform:scale(.7)}50%{opacity:.8}to{opacity:0;transform:scale(1.5)}}.arena-reduced *{animation:none!important}@media (prefers-reduced-motion:reduce){.arena-tunnel *{animation:none!important}}@media (width<=600px){.arena-shell{padding:12px}.arena-menu{padding-top:6vh}.arena-hud{gap:5px}.arena-hud>div{padding:7px 3px}.arena-hud strong{font-size:25px}.math-arena small{font-size:9px}.arena-game{margin:18px auto}.arena-equation{margin:18px auto 12px;padding:22px 5px}.arena-game>input{padding:7px;font-size:28px}.arena-panel{margin:25px auto;padding:20px}.arena-results{gap:5px}.arena-results strong{font-size:38px}.arena-pad button{min-height:42px;padding:5px}.arena-feedback{height:24px;font-size:13px}.arena-instruction{margin:8px}.arena-game .arena-exit{margin-top:5px}}.arena-hit{position:relative}.arena-hit:after{content:"";pointer-events:none;filter:drop-shadow(0 0 8px #00ff91);background:radial-gradient(circle at 5% 20%,#8affcd 0 2px,#0000 3px),radial-gradient(circle at 95% 80%,#8affcd 0 3px,#0000 4px),radial-gradient(circle at 90% 10%,#8affcd 0 2px,#0000 3px),radial-gradient(circle at 12% 90%,#8affcd 0 2px,#0000 3px);position:absolute;inset:-12px}.ramstad-holograms{perspective:1100px;position:absolute;inset:0}.ramstad-hologram{text-align:center;color:#72eaff;text-shadow:0 0 12px #00baff;background:repeating-linear-gradient(0deg,#00d7ff09 0 2px,#0000 2px 5px),linear-gradient(135deg,#0b6db84a,#00143399);border:2px solid #32d6ff;border-radius:8px;width:190px;padding:22px 12px 8px;animation:4s ease-in-out infinite alternate ramstad-glow;position:absolute;top:23%;box-shadow:0 0 12px #00adff,inset 0 0 35px #006aff77,0 0 65px #005dff55}.ramstad-hologram.left{left:4%;transform:rotateY(35deg)rotate(-3deg)}.ramstad-hologram.right{right:4%;transform:rotateY(-35deg)rotate(3deg)}.ramstad-r{color:#0000;-webkit-text-stroke:2px #4adaff;text-shadow:none;filter:drop-shadow(0 0 8px #0af);font-size:100px;font-weight:900;line-height:1.1;display:block}.ramstad-hologram strong{letter-spacing:.06em;font-size:25px;display:block}.ramstad-hologram small{letter-spacing:.15em;font-size:10px}.ramstad-hologram svg{fill:none;stroke:#25d8ff;stroke-width:.8px;filter:drop-shadow(0 0 4px #0af);width:100%;margin-top:20px}.arena-kicker strong{letter-spacing:.15em;text-shadow:0 0 18px #00baff;font-size:30px;display:block}.arena-kicker small{letter-spacing:.2em;font-size:9px}.arena-floor{background:repeating-linear-gradient(90deg,#0000 0 78px,#0cf9 79px 81px),repeating-linear-gradient(0deg,#00254d77 0 36px,#ff39b866 38px 40px,#020a1888 42px 78px,#00caff 79px 81px)}.arena-menu h1{-webkit-text-fill-color:transparent;filter:drop-shadow(0 2px 1px #1c45af);background:linear-gradient(#fff 15%,#b7e8ff 40%,#3456bc 60%,#ffbdff 85%,#fff);-webkit-background-clip:text;background-clip:text}.arena-menu h1 em{-webkit-text-fill-color:#ffc449}.arena-result h3{border:1px solid #ffc64c;border-radius:10px;padding:16px;animation:2s ease-in-out infinite alternate ramstad-glow;box-shadow:0 0 22px #ff9b0044}.arena-panel{border-top:2px solid #5edfff;box-shadow:0 0 35px #006aff55,inset 0 0 45px #00144b99}@keyframes ramstad-glow{to{filter:brightness(1.3);box-shadow:0 0 22px #00afff88,inset 0 0 35px #006aff55}}@media (width<=1100px){.ramstad-hologram{opacity:.45;width:130px;top:31%}.ramstad-r{font-size:65px}.ramstad-hologram strong{font-size:17px}.ramstad-hologram.left{left:-35px}.ramstad-hologram.right{right:-35px}}@media (width<=600px){.ramstad-hologram{opacity:.25;width:110px;top:19%}.ramstad-hologram.left{left:-50px}.ramstad-hologram.right{right:-50px}.arena-menu h1{font-size:72px}.arena-menu{padding-top:3vh}}.arena-table-choices{grid-template-columns:repeat(5,1fr);gap:8px;display:grid}.arena-table-choices button{min-height:70px;margin:0;padding:18px 5px}.arena-table-choices button[aria-pressed=true]{background:linear-gradient(#084697,#031129);border-color:#32daff;box-shadow:0 0 18px #008cff88}.arena-table-choices+label{clip-path:inset(50%);width:1px;height:1px;position:absolute;overflow:hidden}.arena-tunnel{background:var(--arena-scene-dark)}.arena-tunnel:before,.arena-tunnel:after{content:"";pointer-events:none;position:absolute;inset:0}.arena-tunnel:before{background:radial-gradient(ellipse at 50% 40%, color-mix(in srgb, var(--arena-light) 24%, transparent), transparent 48%), repeating-conic-gradient(from 20deg at 50% 40%, transparent 0 14deg, color-mix(in srgb, var(--arena-light) 9%, transparent) 15deg 28deg, color-mix(in srgb, var(--arena-light) 36%, transparent) 29deg 30deg);transition:background .65s}.arena-tunnel:after{background:radial-gradient(ellipse at 50% 40%, transparent 20%, var(--arena-scene-dark) 100%);opacity:.35}.arena-tunnel i{border-color:color-mix(in srgb, var(--arena-light) 50%, transparent);box-shadow:0 0 18px color-mix(in srgb, var(--arena-light) 45%, transparent), inset 0 0 25px color-mix(in srgb, var(--arena-light) 20%, transparent);transition:border-color .65s,box-shadow .65s;animation-duration:6s}.arena-tunnel i:nth-child(3n){border-color:var(--arena-secondary-light);box-shadow:0 0 22px color-mix(in srgb, var(--arena-secondary-light) 40%, transparent)}.arena-floor{background:repeating-linear-gradient(90deg, transparent 0 78px, color-mix(in srgb, var(--arena-light) 65%, transparent) 79px 81px), repeating-linear-gradient(0deg, transparent 0 38px, color-mix(in srgb, var(--arena-secondary-light) 30%, transparent) 39px 41px, transparent 42px 78px, var(--arena-light) 79px 81px);box-shadow:0 -5px 70px color-mix(in srgb, var(--arena-light) 35%, transparent);transition:box-shadow .65s;animation:5s linear infinite arena-floor-flow}.ramstad-hologram{border-color:var(--arena-light);box-shadow:0 0 18px color-mix(in srgb, var(--arena-light) 70%, transparent), inset 0 0 30px color-mix(in srgb, var(--arena-light) 22%, transparent);transition:border-color .65s,box-shadow .65s;animation-name:arena-hologram-breathe}.arena-moving-lights,.arena-depth-particles{pointer-events:none;position:absolute;inset:0;overflow:hidden}.arena-moving-lights span{background:var(--arena-light);width:2px;height:17%;box-shadow:0 0 15px var(--arena-light);transform-origin:50% -160%;opacity:0;animation:4s ease-in infinite arena-light-travel;position:absolute;top:42%;left:5%}.arena-moving-lights span:nth-child(2n){left:auto;right:5%}.arena-moving-lights span:nth-child(3n){height:23%;top:66%;left:23%}.arena-moving-lights span:nth-child(4n){left:auto;right:23%}.arena-moving-lights span:nth-child(2n){animation-delay:-1s}.arena-moving-lights span:nth-child(3n){animation-delay:-2.2s}.arena-moving-lights span:nth-child(5n){animation-delay:-3.1s}.arena-depth-particles span{background:var(--arena-light);width:3px;height:3px;box-shadow:0 0 9px var(--arena-light);opacity:0;border-radius:50%;animation:7s ease-in infinite arena-particle-flight;position:absolute;top:36%;left:16%}.arena-depth-particles span:nth-child(2n){left:auto;right:16%}.arena-depth-particles span:nth-child(3n){top:17%;left:30%}.arena-depth-particles span:nth-child(4n){top:62%;left:auto;right:12%}.arena-depth-particles span:nth-child(5n){top:76%;left:22%}.arena-depth-particles span:nth-child(2n){animation-delay:-1.4s}.arena-depth-particles span:nth-child(3n){animation-delay:-3.3s}.arena-depth-particles span:nth-child(5n){animation-delay:-5.7s}.math-arena[data-arena-mode=blue] .arena-depth-particles span:nth-child(n+7),.math-arena[data-arena-mode=orange] .arena-depth-particles span:nth-child(n+11){display:none}.math-arena[data-arena-mode=purple] .arena-tunnel i{animation-duration:4.8s}.math-arena[data-arena-mode=gold] .arena-tunnel i{animation-duration:4.2s}.math-arena[data-arena-mode=gold] .arena-depth-particles span{width:4px;height:4px;animation-duration:4s}.arena-energy-wave{border:3px solid var(--arena-light);box-shadow:0 0 45px var(--arena-light), inset 0 0 45px color-mix(in srgb, var(--arena-light) 40%, transparent);clip-path:polygon(12% 0,88% 0,100% 18%,100% 82%,88% 100%,12% 100%,0 82%,0 18%);pointer-events:none;animation:.85s ease-out both arena-wave;position:absolute;inset:15%}.arena-streak{text-shadow:0 0 18px color-mix(in srgb, var(--arena-light) 65%, transparent);transition:color .65s,text-shadow .65s;color:var(--arena-light)!important}.arena-equation{background:var(--arena-solid-panel);border-color:var(--arena-light);box-shadow:0 0 20px color-mix(in srgb, var(--arena-light) 65%, transparent), inset 0 0 25px color-mix(in srgb, var(--arena-light) 18%, transparent);text-shadow:0 0 18px color-mix(in srgb, var(--arena-light) 40%, transparent);transition:border-color .18s,box-shadow .18s;position:relative}.math-arena[data-arena-mode=gold] .arena-equation{box-shadow:0 0 32px color-mix(in srgb, var(--arena-light) 72%, transparent), inset 0 0 28px color-mix(in srgb, var(--arena-light) 18%, transparent)}.arena-equation.arena-hit{border-color:var(--arena-success-light);box-shadow:0 0 30px color-mix(in srgb, var(--arena-success-light) 55%, transparent)}.arena-equation.arena-miss{border-color:var(--arena-error-light);box-shadow:0 0 30px color-mix(in srgb, var(--arena-error-light) 55%, transparent)}.arena-hit:after{content:none}.arena-answer-burst{pointer-events:none;--burst-light:var(--arena-success-light);position:absolute;inset:0}.arena-answer-burst.is-wrong{--burst-light:var(--arena-error-light)}.arena-answer-burst span{background:var(--burst-light);width:4px;height:4px;box-shadow:0 0 8px var(--burst-light);animation:.22s ease-out both arena-answer-particle;position:absolute;top:15%;left:5%}.arena-answer-burst span:nth-child(2n){left:auto;right:5%}.arena-answer-burst span:nth-child(3n){top:auto;bottom:15%}.arena-answer-burst span:nth-child(4n){left:18%}.arena-answer-burst span:nth-child(5n){inset:auto 18% 10% auto}.arena-milestone-slot{pointer-events:none;justify-content:center;align-items:center;height:46px;display:flex}.arena-milestone{color:var(--arena-light);text-shadow:0 0 16px var(--arena-light);font-size:18px;font-weight:900;animation:.25s ease-out both arena-milestone-in}.arena-milestone b{font-size:11px;display:block}.arena-feedback{font-size:14px}.math-arena button{height:auto}@keyframes arena-floor-flow{to{background-position:0 0,0 81px}}@keyframes arena-hologram-breathe{to{filter:brightness(1.12)}}@keyframes arena-light-travel{0%{opacity:0;transform:translateY(-25%)scaleY(.3)}40%{opacity:.5}to{opacity:0;transform:translateY(200%)scaleY(1.4)}}@keyframes arena-particle-flight{0%{opacity:0;transform:translateY(-40px)scale(.3)}50%{opacity:.5}to{opacity:0;transform:translateY(220px)scale(1.5)}}@keyframes arena-wave{0%{opacity:.65;transform:scale(.35)}to{opacity:0;transform:scale(2)}}@keyframes arena-answer-particle{0%{opacity:.9;transform:translateY(0)scale(1)}to{opacity:0;transform:translateY(-20px)scale(.3)}}@keyframes arena-milestone-in{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.arena-reduced .arena-depth-particles,.arena-reduced .arena-moving-lights,.arena-reduced .arena-energy-wave,.arena-reduced .arena-answer-burst{display:none}.arena-reduced .arena-milestone{opacity:1}@media (prefers-reduced-motion:reduce){.math-arena *{animation:none!important}.arena-depth-particles,.arena-moving-lights,.arena-energy-wave,.arena-answer-burst{display:none}}@media (width<=600px){.arena-milestone-slot{height:40px}.arena-milestone{font-size:16px}.arena-table-choices{grid-template-columns:repeat(2,1fr)}}@property --arena-light{syntax:"<color>";inherits:true;initial-value:#00cfff}@property --arena-secondary-light{syntax:"<color>";inherits:true;initial-value:#f42bdb}@property --arena-scene-dark{syntax:"<color>";inherits:true;initial-value:#020615}.math-arena{transition:--arena-light .75s,--arena-secondary-light .75s,--arena-scene-dark .75s}.math-arena .arena-tunnel i{animation-duration:6s!important}.math-arena .arena-depth-particles span{transition:opacity .75s;width:3px!important;height:3px!important;animation-duration:6s!important;display:block!important}.math-arena[data-arena-mode=blue] .arena-depth-particles span:nth-child(n+7),.math-arena[data-arena-mode=orange] .arena-depth-particles span:nth-child(n+11){opacity:0}.arena-energy-wave{display:none!important}.math-arena .ramstad-hologram{filter:none;animation:none}.arena-mode-picker{justify-content:center;gap:12px;max-width:700px;margin:20px auto;display:flex}.arena-mode-picker button{flex:1;display:block}.arena-mode-picker button[aria-pressed=true]{border-color:#36dcff;box-shadow:0 0 18px #0af5}.arena-mode-picker small{margin-top:8px;font-size:11px;line-height:1.5}.arena-reduced{transition:none!important}@media (prefers-reduced-motion:reduce){.math-arena{transition:none!important}}.math-arena .arena-hud progress{appearance:none;background:#07172a;border:0;border-radius:999px;overflow:hidden}.math-arena .arena-hud progress::-webkit-progress-bar{background:#07172a;border-radius:999px}.math-arena .arena-hud progress::-webkit-progress-value{background:var(--blue);border-radius:999px}.math-arena .arena-hud progress::-moz-progress-bar{background:var(--blue);border-radius:999px}.arena-competition{max-width:850px}.arena-competition-tabs{flex-wrap:wrap;gap:10px;display:flex}.arena-competition-tabs button[aria-pressed=true]{border-color:var(--blue);box-shadow:0 0 14px #00cfff55}.arena-class-choice{gap:8px;margin:20px 0;display:grid}.arena-class-gate{text-align:center}.arena-class-grid{grid-template-columns:repeat(auto-fill,minmax(72px,1fr));gap:10px;margin:20px 0;display:grid}.arena-class-grid button{color:#eff7ff;background:#06213b;border:1px solid #00cfff;border-radius:10px;min-height:52px;font-size:18px;font-weight:700}.arena-class-grid button:hover:not(:disabled),.arena-class-grid button:focus-visible{background:#12354c}.arena-class-choice select{color:#eff7ff;background:#07132a;border:1px solid #00cfff;border-radius:8px;width:100%;min-height:44px;padding:12px}.arena-competition-note{color:#b8cce0;font-size:13px;line-height:1.5}.arena-week-leader{background:#06213b;border:1px solid #00cfff;border-radius:12px;margin:24px 0;padding:20px}.arena-week-leader>strong{font-size:clamp(28px,6vw,44px)}.arena-class-list,.arena-alltime ol{padding:0;list-style:none}.arena-class-list li,.arena-alltime li{border-bottom:1px solid #274361;grid-template-columns:40px 1fr auto;align-items:center;gap:10px;padding:12px;display:grid}.arena-class-list li[data-leader=true]{background:#12354c;border-left:3px solid #00cfff}.arena-alltime{background:linear-gradient(135deg,#322509,#071326);border:1px solid #ffdb67;border-radius:12px;margin-top:32px;padding:20px}.arena-alltime .arena-record-score{color:#ffdb67;text-shadow:0 0 20px #ffa62b66;font-size:clamp(30px,7vw,56px);display:block}.arena-alltime li{grid-template-columns:40px 1fr auto}.arena-alltime time{font-size:12px}.arena-school-record{color:#ffdb67;border:2px solid #ffdb67;border-radius:12px;margin:20px 0;padding:18px;animation:.7s ease-out both arena-shared-record}@keyframes arena-shared-record{0%{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}@media (prefers-reduced-motion:reduce){.arena-school-record{animation:none}}.arena-reduced .arena-school-record{animation:none}.arena-music-toggle{min-height:44px;margin:14px auto 0;display:flex}.arena-music-toggle[aria-pressed=true]{border-color:var(--arena-accent,currentColor)}.arena-teacher-choice{grid-column:span 2}.arena-toolbar{justify-content:center;gap:8px;margin-bottom:10px;display:flex}.arena-toolbar button{min-height:36px;padding:4px 14px;font-size:13px}.arena-pause-overlay{z-index:50;background:#010714ee;flex-direction:column;justify-content:center;align-items:center;gap:14px;padding:24px;font-size:20px;font-weight:700;display:flex;position:fixed;inset:0}.arena-pause-overlay button{min-width:240px;min-height:56px;font-size:18px}@media (width<=600px){.arena-game{padding-bottom:calc(env(safe-area-inset-bottom) + 70px);margin:4px auto}.arena-equation{margin:10px auto 8px;padding:14px 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