original: tarvos , or saturn xxi , is a prograde irregular satellite of saturn .
simplifications: prograde irregular satellite of saturn is a tarvos , or saturn xxi . tarvos , or saturn xxi , is a prograde not regular thing circling in space of saturn . tarvos , or saturn xxi , is a satellite of saturn . tarvos , or saturn xxi , is a prograde irregular satellite of saturn . tarvos or saturn xxi is an irregular satellite of saturn . tarvos is a prograde irregular satellite of saturn . tarvos , or saturn xxi , is a prograde -lrb- proceeding from west to east -rrb- irregular satellite of saturn . an irregular satellite of saturn is tarvos also known as saturn xxi .