0,0,,
1,1,a,
1,1,,b
0,1,a,a
2,2,a,b
3,1,aaa,
3,1,,bbb
0,1,aaa,aaa
6,2,aaa,bbb
4,2,a,bbb
4,2,aaa,b
18,1,aaaaaaaaaaaaaaaaaa,
18,1,,bbbbbbbbbbbbbbbbbb
1,2,ab,a
1,2,a,ab
2, 3, abc, abd
1,2,abc,abcd
1,2,abcd,bcd
1,3,abc,abbc
