:cs 2 6 a
:cs 2 9 b
:cs 5 6 a
:cs 5 8 x
:cs 5 18 c
:cs 5 22 d
:cs 8 19 b
:cs 9 15 x
:cs 12 14 y
:cs 17 3 y
:cs 20 5 x
:cs 20 19 a
:cs 20 52 b
:cs 20 67 c
:q
