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range(x,y) will create a range of elements from x to y-1
if only one parameter is passed x is assumed to be 0
so range(y) will create elements in range from 0 till y-1
so here range(4) will create a range which includes 0,1,2,3 hence the loop will iterate 4 times as there are 4 elements
can you write the complete code snippet using the range(4), I'm getting error. Thanks!