iiii iiio iiis iiit iioi iioo iiop iios iirs iisi iisp iisr iist iitr iitt ioii ioio ioit iooi iooo ioos iops iori iors ioso ioto ipop ipos ippo ippr ipri ipsi ipso ipsp ipss ipto ipts iri- irio irip iris irop irps irri irrs irsp irti irtp irts isis isit iso- isop isor isos ispr isps isri isrp issi isso issp issr isss isti isto istp istr ists itis itoi itoo itor itos itri itrs itsi itso itsp itto oiii oios oirt oist oiti oooo ooos oops oort oosi oost ootp oots opii opio opis opit opo- opor opos oppi oppo opps opsi opti opto opts ori- orio oris orit oro- oror oros orot orpi orps orri orro orrs orsi orso orto orts osii osip osis osoi osoo osor osos osro ossi osso osti ostr osts otis otit oto- otoo otor otos otpp otro otrs otso otti otto otts piip piot pipi pipo pipp pips piri piro pirr pirs pisi piso piss pist piti pito pitr pits pitt poio pois poop poor poos poot pop- popi popo popp pops popt pori poro porr pors port posi poso poss post poti poto pots pott ppos pppo pppp ppps ppss ppts pptt pri- prii pris pro- proo prop pros prot prps prri prrs prsi prso prss prti prtp prtr psip psis psoi psos pspi pspp pspr psps psrp psso psst psts ptop riis rios riot ripi ripp ripr rips ript riri rirs risi riso risp riss rist riti rito rits ritt roio roir rois roit rooi roop roor roos root ropo rops rori roro rort rosi roso rosp ross rost roti roto rotr rots rott rpii rpos rpps rpts rrrr rrsp rsis rsos rspo rsps rstp rsts rtps rtss rttp rtts s-ii s-os siit siop sior sios siot sipi sipo sipp sips sipt siri siro sirp sirr sirs sirt sisi siss sist sit- siti sito sits sitt soir sois soit soop soor soos soot sopi sopo sopp sops sori soro sorr sors sort sosi soso soss sost soto sotp sots spio spip spir spis spit spoo spop spor spos spot spps spri spro sprs spso spsp spss spst spto sptr spts sris sros srps srpt srsp srtp srtr ssis ssit ssop ssot sspo ssps sspt ssri ssrs sssi ssss sstp ssts stio stip stir stis stit stoo stop stor stos stot stpp stps stri stro strs stsi stss sttr tiit tiop tios tip- tipi tipo tipp tips tipt tiri tiro tirr tirs tisi tiso tiss tist titi tito titp tits titt tois toit toor toos toot top- topi topo topp tops topt tori toro torp torr tors tort tosi toso toss tost toti toto totr tots tott tpir tppp tppr tprs tptp tptr tri- trio trip tris trit troi troo trop tros trot trpp trps trsi trst trtr tsis tsoi tsop tsos tspo tsps tspt tssi tssr tsst tsts ttop ttss tttt