(setq *maze-graph*
'((1 2) (2 3) (3 4) (4 9) (9 14) (9 8)
(8 7) (7 12) (12 13) (12 11) (11 6)
(11 16) (14 15) (16 17) (17 22)
(21 22) (22 23) (23 18) (23 24)
(24 19) (19 20) (20 15) (15 10)
(10 5) (20 25)))