22
11 12
11 13
11 15
11 16
12 12
12 13
12 15
12 16
13 13
13 15
14 11
14 13
14 15
14 17
15 11
15 13
15 15
15 17
16 11
16 12
16 16
16 17
A tumbler; turns end over end.