A stochastic top-down parser using the PCFG estimated from the trees produced by T L simulates a stochastic generalized left-corner parser, which i s a generalization of a standard stochastic left-corner parser that permits productions to be recognized top-down as well as left-corner Manning and Carpenter, 1997.
investigating the properties of PCFG estimated from trees transformed with T L is an easy way of studying stochastic push-down automata performing generalized left-corner parses.