iiii iiio iiit iioi iioo iiop iitr iitt ioii ioio ioit iooi iooo iori ioto ipop ippo ippr ipri ipto iri- irio irip irop irri irti irtp itoi itoo itor itri itto oiii oirt oiti oooo oort ootp opii opio opit opo- opor oppi oppo opti opto ori- orio orit oro- oror orot orpi orri orro orto otit oto- otoo otor otpp otro otti otto piip piot pipi pipo pipp piri piro pirr piti pito pitr pitt poio poop poor poot pop- popi popo popp popt pori poro porr port poti poto pott pppo pppp pptt pri- prii pro- proo prop prot prri prti prtp prtr ptop riot ripi ripp ripr ript riri riti rito ritt roio roir roit rooi roop roor root ropo rori roro rort roti roto rotr rott rpii rrrr rttp tiit tiop tip- tipi tipo tipp tipt tiri tiro tirr titi tito titp titt toit toor toot top- topi topo topp topt tori toro torp torr tort toti toto totr tott tpir tppp tppr tptp tptr tri- trio trip trit troi troo trop trot trpp trtr ttop tttt