int main() { for(int i=1; i<5; i++) for(int j=1; j<5; j++) { printf("i%d j%d\n",i,j); } return 0; } out put should look like this; i1 j1 i1 j2 i1 j3 i1 j4 i2 j1 i2 j2 i2 j3 i2 j4 i3 j1 i3 j2 i3 j3 i3 j4 i4 j1 i4 j2 i4 j3 i4 j4
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