what is the river whose source is arroyo bayo and has it's mouth located in arroyo de la laguna ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_source dbr_Arroyo_Bayo sep_dot var_uri dbo_riverMouth dbr_Arroyo_de_la_Laguna sep_dot var_uri a dbo_River brack_close