iiii iiit iitr iitt ippr ipri ipur iput iri- irip irri irti irtp itri itup itur iuiu iupp piip pipi pipp piri pirr piru piti pitr pitt pitu pppp ppru pptt ppur pri- prii prri prti prtp prtr prut pruu ptui puir puit puiu pupi pupu pur- puri purp purr puru put- puti putt putu ripi ripp ripr ript riri riti ritt ritu rpii rrrr rttp ruit rupp rupt ruri rurp ruru ruti rutt rutu tiit tiiu tip- tipi tipp tipt tipu tiri tirr tiru titi titp titt titu tpir tppp tppr tptp tptr tput tri- trip trit trpp trtr trut truu tttt tuit tuiu tupi tupu turi turp turr turt turu tuti tutt tutu u-rp uipi uirr uppp uppu upri upup uriu urri urup urur urut utri utti uttu uuri uuuu