16
abc
0010000000000002
0 a 1
0 b 1
0 c 1
1 @ 3
1 @ 0
2 @ 0
2 @ 3
3 @ 14
4 a 5
5 @ 6
6 b 7
7 @ 15
8 a 9
9 @ 10
10 a 11
11 @ 12
12 c 13
13 @ 15
14 @ 4
14 @ 8