e-one eeeee eepee enone enope enpo epeen epene epone n-p-n nenno neope neppe nnooo no-no no-op nonne nonno nonop noone nopep noppe oeno- oenoe oeppo onene oneno oneon oneop onne- onnen onone onoon onpop ooooo opepe opone oppon p-n-p peene pene- penne penon peone pepee pepon peppe pneo- po-on po-po ponne poope poopo popon popop poppe poppo