Which clip belongs to this question?
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<html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><title>Which clip belongs to this question?</title><style>:root{color-scheme:light;--ink:#192e38;--accent:#255e61;--wash:#e6f1ed;--paper:#faf9f4}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:17px/1.6 system-ui,sans-serif}main{max-width:1040px;margin:auto;padding:22px 24px 42px}header{border-top:5px solid var(--accent);padding-top:12px;margin-bottom:17px}.eyebrow{font-size:16px;font-weight:750;color:var(--accent);margin:0 0 4px}h1{font-size:clamp(26px,4vw,38px);line-height:1.2;letter-spacing:-.025em;margin:0 0 10px}h2{font-size:23px;line-height:1.3;margin:0 0 12px}h3{font-size:19px;margin:0 0 8px}p{margin:0 0 13px}.lede{max-width:850px}.stage{background:white;border:1px solid #b4c4c8;border-radius:10px;padding:20px;margin:15px 0}.sample{background:var(--wash);border-left:5px solid var(--accent);padding:16px;margin:12px 0}.result{border-top:3px solid var(--accent);padding:16px 0 4px;margin-top:14px;font-weight:700;font-size:19px;white-space:pre-wrap;overflow-wrap:anywhere}.detail{white-space:pre-wrap;overflow-wrap:anywhere}button,input,textarea,select{font:inherit}button{min-height:46px;background:var(--accent);color:white;border:1px solid var(--accent);border-radius:6px;padding:9px 14px;cursor:pointer;font-weight:650}button:hover{filter:brightness(.9)}button[aria-pressed=true]{box-shadow:inset 0 0 0 3px #d5f525}button:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #245bad;outline-offset:3px}button:disabled{opacity:.6;cursor:default}.controls{display:flex;flex-wrap:wrap;gap:8px;margin:12px 0}label{display:block;font-weight:650;margin:11px 0 6px}input,textarea{display:block;width:100%;min-width:0;max-width:100%;background:white;color:var(--ink);border:1px solid #8199a1;border-radius:5px;padding:10px 12px}textarea{min-height:110px;resize:vertical;font:16px/1.5 ui-monospace,Consolas,monospace}.grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.grid>*{min-width:0}ul,ol{padding-left:23px}li{margin:6px 0}.small,summary,footer{font-size:16px;color:#415964}code,pre{font:16px/1.5 ui-monospace,Consolas,monospace}pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#edf1f1;padding:16px;border-radius:6px}code{overflow-wrap:anywhere}.chip{display:inline-block;border:1px solid #95aeb4;border-radius:4px;padding:2px 8px;font-size:16px;margin:3px}svg{display:block;width:100%;height:auto}svg text{font-family:system-ui,sans-serif}details{margin:20px 0;border-top:1px solid #a7bdc2;padding-top:13px}summary{cursor:pointer;font-weight:750}mark{background:#d5f525;color:#202600}footer{border-top:1px solid #a7bdc2;padding-top:15px;margin-top:22px}table{width:100%;border-collapse:collapse;table-layout:fixed}th,td{padding:10px 8px;text-align:left;vertical-align:top;border-bottom:1px solid #c2cfd2;overflow-wrap:anywhere}th{background:var(--wash)}.number{font-size:32px;font-weight:800}.note{border-left:3px solid #a78e51;padding-left:12px}@media(max-width:650px){main{padding:15px 17px 30px}.grid{grid-template-columns:1fr;gap:14px}.stage{padding:15px}header{margin-bottom:12px}.controls button{flex:1 1 auto}h1{font-size:27px}th,td{padding:8px 5px}}audio{display:block;width:100%;max-width:100%;min-width:0}</style></head><body><main style="--accent:#694e8e;--wash:#f0eafb"><header><p class="eyebrow">LISTENING / CLIP-ID PRACTICE</p><h1>Which clip belongs to this question?</h1><p class="lede">Original local pulse sounds. Choose listening or explicitly labeled text practice.</p></header><section class="stage"><div class="controls"><button type="button" id="q1">Q1</button><button type="button" id="q2">Q2</button><button type="button" id="text">Text practice</button><button type="button" id="listen">Listening mode</button></div><h2 id="question"></h2><p id="audioInfo"></p><audio id="audio" controls preload="none" aria-label="Current original pulse clip"></audio><div class="controls"><button type="button" id="play">Play current clip</button><button type="button" id="one">ONE</button><button type="button" id="two">TWO</button><button type="button" id="three">THREE</button><button type="button" id="check">Check response</button><button type="button" id="reset">Reset</button></div><p id="mediaStatus"></p><p id="pattern"></p><p id="result" class="result" role="status" aria-live="polite"></p></section><footer>Original fictional practice example. Current-page interaction only; no saved records or external requests.</footer></main>
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const media=$('#audio');let question='Q1',mode='listening',selected='',started=false,generation=0;const manifest={Q1:{clip:'clipA',pulses:1,key:'ONE'},Q2:{clip:'clipB',pulses:2,key:'TWO'}};function wav(pulses){const rate=16000,n=12800,bytes=new Uint8Array(44+n*2),d=new DataView(bytes.buffer);const text=(offset,s)=>[...s].forEach((ch,i)=>d.setUint8(offset+i,ch.charCodeAt(0)));text(0,'RIFF');d.setUint32(4,bytes.length-8,true);text(8,'WAVE');text(12,'fmt ');d.setUint32(16,16,true);d.setUint16(20,1,true);d.setUint16(22,1,true);d.setUint32(24,rate,true);d.setUint32(28,rate*2,true);d.setUint16(32,2,true);d.setUint16(34,16,true);text(36,'data');d.setUint32(40,n*2,true);for(let i=0;i<n;i++){const offset=i<1600?i:pulses===2&&i>=6400&&i<8000?i-6400:-1;const envelope=offset<0?0:Math.min(1,offset/80,(1599-offset)/80);d.setInt16(44+i*2,Math.round(.15*32767*envelope*Math.sin(2*Math.PI*440*i/rate)),true);}return bytes;}function update(){generation++;if(typeof media.pause==='function')media.pause();started=false;selected='';const record=manifest[question],bytes=wav(record.pulses);media.src='data:audio/wav;base64,'+btoa(Array.from(bytes,v=>String.fromCharCode(v)).join(''));media.volume=.15;if(typeof media.load==='function')media.load();out('#question',question+': How many pulses?');out('#audioInfo',record.clip+' · 800 ms · '+bytes.length+' generated WAV bytes');out('#mediaStatus','Playback not started.');out('#pattern',mode==='text'?'Text practice: '+(record.pulses===1?'one pulse at 0–100 ms.':'two pulses at 0–100 ms and 400–500 ms.'):'Listening mode; text alternative available.');out('#result','No submitted answer.');}on('#play',()=>{const token=generation;out('#mediaStatus','Play requested; start pending.');if(typeof media.play!=='function'){out('#mediaStatus','Playback unavailable in this execution environment.');return;}media.play().then(()=>{if(token===generation){started=true;out('#mediaStatus','Playback started; hearing/understanding not established.');}}).catch(()=>{if(token===generation){started=false;out('#mediaStatus','Playback failed; listening check held.');}});});media.addEventListener('playing',()=>{if(media.currentSrc!==media.src)return;started=true;out('#mediaStatus','Playback started; hearing/understanding not established.');});media.addEventListener('error',()=>{if(media.currentSrc!==media.src)return;started=false;out('#mediaStatus','Media error; listening check held.');});on('#q1',()=>{question='Q1';update();});on('#q2',()=>{question='Q2';update();});on('#text',()=>{mode='text';update();});on('#listen',()=>{mode='listening';update();});[['one','ONE'],['two','TWO'],['three','THREE']].forEach(([id,v])=>on('#'+id,()=>{selected=v;out('#result','Selected '+v+'; check current '+question+'.');}));on('#check',()=>{if(!selected){out('#result','Incomplete: choose an option.');return;}if(mode==='listening'&&!started){out('#result','Held: listening playback has not started.');return;}out('#result',(mode==='text'?'Text practice':'Listening response')+': '+(selected===manifest[question].key?'correct':'incorrect')+' for '+question+'/'+manifest[question].clip+'. No accumulated score.');});on('#reset',()=>{question='Q1';mode='listening';update();});update();
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