dddd didi didu diii dipp dipt dipu dird dirr dirt diti ditt dpdt drip drit drui drup drut druu dtdp dttp dudd dudu duid duir duit duri durt duru dutp duur duut idid idir idtp iiii iiit iitr iitt ipdi ipid ippr ipri ipur iput irdp iri- irid irip irri irti irtp itri itup itur iuiu iupp pdpr piip pipi pipp piri pirr piru piti pitr pitt pitu ppid pppd pppp ppru pptt ppur pri- prid prii prpd prrd prri prti prtp prtr prud prut pruu ptpd ptrd ptui pudu puid puir puit puiu pupi pupu pur- puri purp purr puru put- puti putt putu ridd ridi ripd ripi ripp ripr ript riri riti ritt ritu rpdp rpii rptd rrrr rtdt rttp rudd rudi rudp ruid ruit rupp rupt rurd ruri rurp ruru ruti rutt rutu ruud tdri tidd tiit tiiu tip- tipi tipp tipt tipu tird tiri tirr tiru titi titp titt titu tpdu tpir tppd tppp tppr tptp tptr tput tri- trip trit trpp trtr trud trut truu tttt tudi tudu tuit tuiu tupi tupu turd turi turp turr turt turu tuti tutt tutu u-rp uddi udid udir udpd uipi uirr uppp uppu upri upup urdu uriu urri urup urur urut utid utpd utri utti uttu uuri uuuu