iiii iiio iiis iiit iioi iioo iiop iios iisi iisp iist iitt ioii ioio ioit iooi iooo ioos iops ioso ioto ipop ipos ippo ipsi ipso ipsp ipss ipto ipts isis isit iso- isop isos isps issi isso issp isss isti isto istp ists itis itoi itoo itos itsi itso itsp itto oiii oios oist oiti oooo ooos oops oosi oost ootp oots opii opio opis opit opo- opos oppi oppo opps opsi opti opto opts osii osip osis osoi osoo osos ossi osso osti osts otis otit oto- otoo otos otpp otso otti otto otts piip piot pipi pipo pipp pips pisi piso piss pist piti pito pits pitt poio pois poop poos poot pop- popi popo popp pops popt posi poso poss post poti poto pots pott ppos pppo pppp ppps ppss ppts pptt psip psis psoi psos pspi pspp psps psso psst psts ptop s-ii s-os siit siop sios siot sipi sipo sipp sips sipt sisi siss sist sit- siti sito sits sitt sois soit soop soos soot sopi sopo sopp sops sosi soso soss sost soto sotp sots spio spip spis spit spoo spop spos spot spps spso spsp spss spst spto spts ssis ssit ssop ssot sspo ssps sspt sssi ssss sstp ssts stio stip stis stit stoo stop stos stot stpp stps stsi stss tiit tiop tios tip- tipi tipo tipp tips tipt tisi tiso tiss tist titi tito titp tits titt tois toit toos toot top- topi topo topp tops topt tosi toso toss tost toti toto tots tott tppp tptp tsis tsoi tsop tsos tspo tsps tspt tssi tsst tsts ttop ttss tttt