iiii iiio iiis iioi iioo iiop iios iisi iisp ioii ioio iooi iooo ioos iops ioso ipix ipop ipos ippo ippy ipsi ipso ipsp ipss isis iso- isop isos isps ispy issi isso issp isss issy isys ixos ixxi 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 oxi- oxis oxo- oxos oxox oxsi oxxo oxy- oyss piip pipi pipo pipp pips pipy pisi piso piss pisy pixo pixx pixy piyo piys poio pois poix poop poos pop- popi popo popp pops popy posi poso poss posy poxy 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 siox sipi sipo sipp sips sipy sisi siss sisy sixo sixx siyi sois soop soos sooy sopi sopo sopp sops sopy sosi soso soss soxs soyo soys spio spip spis spix spoo spop spos spox spoy spps spso spsp spss spy- spys ssis ssop sspo ssps sspx sssi ssss syis sypo syso syss xiii xisi xixi xois xoxo xoyo xxii xxix xxxi xxxo xxxx xxxy yips yiss yoix yoop yopo yopy yosi yoso yoyo ypsi ysii ysop yspi yyyy