query: SELECT count(DISTINCT winner_name) FROM matches WHERE tourney_name  =  'WTA Championships' AND winner_hand  =  'L'
question: Find the number of left handed winners which participated in the WTA Championships.
query_toks: SELECT count ( DISTINCT winner_name ) FROM matches WHERE tourney_name = 'WTA Championships ' AND winner_hand = 'L '
query_toks_no_value: select count ( distinct winner_name ) from matches where tourney_name = value and winner_hand = value
question_toks: Find the number of left handed winners which participated in the WTA Championships.