ana helena chacón echeverría and ana helena chacón echeverría are leaders of which place ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_leader dbr_Ana_Helena_Chacón_Echeverría sep_dot var_uri dbo_leader dbr_Ana_Helena_Chacón_Echeverría sep_dot var_uri a dbo_Place brack_close