test 1 a = 1 b = 2 c = 3 d = 4 test 2 a = 1 b = 2 c = 3 d = 4 test 3 a = 1 b = 2 c = 3 test 4 a = 1 b = 2 c = 3 d = 5 test 5 e,e e,b b,e b,b b,c c,e c,b c,c c,d d,e d,b d,c d,d