!Name: Figure eight on pentadecathlon
!The smallest known period 120 oscillator.
!https://www.conwaylife.com/wiki/index.php?title=Figure_eight_on_pentadecathlon
.O......OO
.O......OO.O
O.O.........O
.O.......O
.O........O.OO
.O..........OO
.O
O.O
.O
.O