This is an old revision of the document!


a b c d A B C D #
find_a (find_c, A, R) (find_d, B, R) (check_no_cs, C, R)
find_b (find_d, B, R) (check_no_ds, C, R)
find_c (find_c, a, R) (find_c, b, R) (rewind_a, C, L)
find_d (rewind_b, D, L) (find_d, C, R) (find_d, D, R)
rewind_a (rewind_a, a, L) (rewind_a, b, L) (find_a, A, R) (rewind_a, C, L)
rewind_b (rewind_b, b, L) (find_b, B, R) (rewind_b, C, L)
check_no_cs (reject, c, R) (check_no_cs, C, R)
check_no_ds (reject, d, R) (check_no_ds, C, R) (check_no_ds, D, R)