(setq *D
   (quote
      (0 3 1 7 5 9 8 6 4 2)
      (7 0 9 2 1 5 4 8 6 3)
      (4 2 0 6 8 7 1 3 5 9)
      (1 7 5 0 9 8 3 4 2 6)
      (6 1 2 3 0 4 5 9 7 8)
      (3 6 7 4 2 0 9 5 8 1)
      (5 8 6 9 7 2 0 1 3 4)
      (8 9 4 5 3 6 2 0 1 7)
      (9 4 3 8 6 1 7 2 0 5)
      (2 5 8 1 4 3 6 7 9 0) ) )
(de damm? (N)
   (let R 1
      (for N (mapcar format (chop N))
         (setq R (inc (get *D R (inc N)))) )
      (= 1 R) ) )
(println (damm? 5724))
(println (damm? 5727))
(println (damm? 112946))
(println (damm? 112940))