which mountain is located in gwynedd and has a parent peak named carnedd y filiast ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_locatedInArea dbr_Gwynedd sep_dot var_uri dbo_parentMountainPeak dbr_Carnedd_y_Filiast_ attr_open Cerrigydrudion attr_close sep_dot var_uri a dbo_Mountain brack_close