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[Programming] What is the output of the following programme ?

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#include <stdio.h>
int main()
{
    int a[] = {50, 60, 10, 30, 40, 20 };
    int *b[] = {a+3, a+4, a, a+2, a+1, a+5 };
    int **c = b;
    c++;
    printf("%u, %u, %u\n", c-b, *c - a, **c);
    return 0;
}
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