(2, 0) = (2, 0, R)
(2, 1) = (2, 1, R)
(2, ?) = (3, ?, L)
(2, >) = (2, >, R)
(3, 0) = (4, 1, S)
(3, 1) = (3, 0, L)
(3, >) = (5, >, R)
(4, 0) = (1, 0, S)
(4, 1) = (1, 1, S)
(5, 0) = (6, 1, R)
(5, ?) = (4, 1, S)
(6, 0) = (6, 0, R)
(6, ?) = (4, 0, S)