Dominos 8x7 #1 Very Difficult

unit 33 begin cols 8 rows 7 problem 3 5 2 4 5 1 3 3 1 2 3 6 6 0 0 6 6 6 2 5 0 6 5 1 1 1 0 5 0 4 6 2 1 5 0 2 3 0 2 1 4 5 1 2 4 3 3 5 0 3 4 6 2 4 4 4 solution a a d e e g g i b c d f f h h i b c k k m m o p j j l l n n o p q r s t u v v x q r s t u w w x y y z z 1 1 2 2 end