iiii iiio iiis iioi iioo iiop iios iisi iisp ioii ioio iooi iooo ioos iops ioso ipop ipos ippo ippy ipsi ipso ipsp ipss isis iso- isop isos isps ispy issi isso issp isss issy isys iyos oiii oios oooo ooos oops oosi opii opio opis opo- opos oppi oppo opps oppy opsi opsy osii osip osis osoi osoo osos ossi osso ossy osyp oyss piip pipi pipo pipp pips pipy pisi piso piss pisy piyo piys poio pois poop poos pop- popi popo popp pops popy posi poso poss posy poyo poys ppos pppo pppp ppps ppss psip psis psoi psos pspi pspp psps psso psy- psys pyo- pyos pypy pyss s-ii s-os siop sios sipi sipo sipp sips sipy sisi siss sisy siyi sois soop soos sooy sopi sopo sopp sops sopy sosi soso soss soyo soys spio spip spis spoo spop spos spoy spps spso spsp spss spy- spys ssis ssop sspo ssps sssi ssss syis sypo syso syss yips yiss yoop yopo yopy yosi yoso yoyo ypsi ysii ysop yspi yyyy