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Complete Code :
<script>
// var x = 20;
// var x = 30;
// document.write(x)
// const x = 20;
// x = 30;
// document.write(x)
// let x = 50
// x = 30
// document.write(x)
var x = 40;
const y = 90;
let z = 80
document.write(window.x);
document.write(window.y);
document.write(window.z);
// window is an object used to describe variable globally.
</script>
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