1,2,3,4,5,6,abc,7,8,9,10,11,12,13,14,15,bcd
2,3,4,5,6,7,abc,8,9,10,11,12,13,14,15,16,bcd
3,4,5,6,7,8,abc,9,10,11,12,13,14,15,16,17,bcd
4,5,6,7,8,9,abc,10,11,12,13,14,15,16,17,18,bcd
