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<canvas id=C> <script> function T(a,b,c,d,e,f,g,h){with(C.getContext("2d"))return beginPath(),moveTo(a,b),lineTo(c,d),lineTo(e,f),fill(),!!getImageData(g,h,1,1).data[3]} console.log(T(10,10,100,10,10,100,15,15)); console.log(T(10,10,100,10,10,100,5,5)); </script>

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