4 r r 2 a b c d a 66
b c d 3 4 j k l m d a a b c d e fghi r b c r n o p 4 67
4 d e f r g r h r i r j k l m n r o p r 68
2 r r 4 69
4 2 3 4 2 2 3 2 70
2 r r 4 2 7
4 2 3 2 3 a b a b c c 72
4 b a 4 a b 2 3 73
4 4 5 2 3 2 2 3 r r 74