The array (1,8,6,2) is intial input into INSERT function. Every one loop to the place of index 1 (2nd element) is insert "i" value. All elements are moved to next index. So before first execute the array is (1,8,6,2), "i" is 0 in first execute, so number 0 is insert on index 1 - array will be (1,0,8,6,2). Than i is 1 so (1,1,0,8,6,2) , than 2 (1,2,1,0,8,6,2) etc..
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