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 var ctx = document.getElementById('tutorial').getContext('2d');
 ctx.save();
   for (i=0;i<10;i++){
     ctx.lineWidth = 1+i;
     ctx.beginPath();
     ctx.moveTo(5+i*14,5);
     ctx.lineTo(5+i*14,140);
     ctx.stroke();
   }
 ctx.restore();
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