PASS - a1 += a2: -4 -3 -2 -1 0 1 2 3 4

PASS - a2 += a2: 0 1 2 3 4 0 1 2 3 4

PASS - -- PASS: -- MESG: a1 += a2: 11 12 13 14 21 22 23 24 31 32 33 34 41 42 43 44

PASS - a2 += a2: 31 32 33 34 41 42 43 44 31 32 33 34 41 42 43 44

PASS - Miss matched multi-dimensional arrays