which executive producer of the richie rich/scooby-doo show is also an important person at metro-goldwyn-mayer cartoon studio ?
SELECT DISTINCT var_uri where brack_open dbr_The_Richie_Rich/Scooby-Doo_Show dbo_executiveProducer var_uri sep_dot dbr_Metro-Goldwyn-Mayer_cartoon_studio dbo_keyPerson var_uri brack_close