What is the output of the awk program? begin { a[1]="cst" a[2]="cst" for(i=1; i< 4; i++) { print a[i] } } etc.

We know that a[1]="CST", and a[2]="CST", and a[3] is either undefined or previously defined.  We assume it is undefined.

The loop goes from 1 to 3, so it will print a[1] to a[3].  Undefined a[3] will be treated as a null string, so the output will be

CSTCST

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