<html>
<head>
<script>
if(true){
var x=3;
console.log("x: "+x);
let y=3;
console.log("y: "+y);
}
console.log("x: "+x);
//Uncaught ReferenceError: y is not defined
//console.log("y: "+y);
for(let i=0;i<4;i++){
console.log(i);
}
//Uncaught ReferenceError: i is not defined
//console.log("i: "+i);
</script>
</head>
<body>
<h1> Olsun </h1>
</body>
</html>
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