# start = S, 5 nonterminals, 4 terminals, 7 productions
S        -> T_d T_a                  [0.273]
T_b      -> b                        [1.000]
T_a      -> T_c T_a                  [0.917]
T_c      -> c                        [1.000]
T_d      -> d                        [1.000]
T_a      -> a                        [0.083]
S        -> T_b T_a S                [0.727]