iiii iiio iiis iioi iioo iiop iios iirs iisi iisp iisr ioii ioio iooi iooo ioos iops iori iors ioso ipix ipop ipos ippo ippr ipri ipsi ipso ipsp ipss iri- irio irip iris irix irop irps irri irrs irsp isis iso- isop isor isos ispr isps isri isrp issi isso issp issr isss ixos ixxi oiii oios oooo ooos oops oosi opii opio opis opo- opor opos oppi oppo opps opsi ori- orio oris orix oro- oror oros orpi orps orri orro orrs orsi orso osii osip osis osoi osoo osor osos osro ossi osso oxi- oxis oxo- oxos oxox oxsi oxxo piip pipi pipo pipp pips piri piro pirr pirs pisi piso piss pixo pixx poio pois poix poop poor poos pop- popi popo popp pops pori poro porr pors posi poso poss ppos pppo pppp ppps ppss pri- prii pris prix pro- proo prop pros prox prps prri prrs prsi prso prss psip psis psoi psos pspi pspp pspr psps psrp psso riis rios ripi ripp ripr rips riri rirs risi riso risp riss rixo roio roir rois rooi roop roor roos roox ropo rops rori roro rosi roso rosp ross roxo rpii rpix rpos rpps rrrr rrsp rsis rsos rspo rsps s-ii s-os siop sior sios siox sipi sipo sipp sips siri siro sirp sirr sirs sisi siss sixo sixx soir sois soop soor soos sopi sopo sopp sops sori soro sorr sors sosi soso soss soxs spio spip spir spis spix spoo spop spor spos spox spps spri spro sprs spso spsp spss sris sros srps srpx srsp ssis ssop sspo ssps sspx ssri ssrs sssi ssss xiii xisi xixi xois xoro xorp xors xoxo xxii xxix xxxi xxxo xxxx