[ 0 swap witheach
      [ char 0 - dip
          [ table
            [ 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 ] ]
        peek ] ]                      is damm      ( $ --> n )

  [ damm 0 = ]                        is dammvalid ( $ --> b )

  [ dup echo$ say " is "
    dammvalid not if [ say "not " ]
    say "valid." cr ]                 is validate  ( & -->   )

  $ "5724 5725 112946 112949"
  nest$ witheach validate