-ing dddd didi didu digg digi diii din- ding dini dinn dinu dipn dipp dipu dird dirr dpin dpni dprg drin drip drug drui drup druu dudd dudu dugu duid duin duir dung dunn durg duri durn duru duur gggg ggrn gidd gidi gigg gigi gign ging gini ginn ginu gipi gipp gird girg giri girn girr giru giur gnin gnip gnrr gpgp gpip gprd gprp grid grig grin grip grni grrr grug grui grun grur gudi gudu gugg gugi gugu guid guin gund gung gunn gurd gurg guri gurn gurr guru idid idig idin idir idun igni ignu igri iiii ind- indi indu inid inig inni innr innu inp- inpi inpp inri inui inun inup ipdi ipid ipin ippr ipri ipur irdp iri- irid irig irin irip irri irun iuiu iupp n-ii n-up ndnp ndpd ndpr ndri ngri ngur nguu nidd nidi nigg niip niir niiu nind ning nini nipr niru niur nngn nnnn nnpi nnpr npin nppd npri nrpn nrrd nudd nudi nuin nung nunn nurd nuri nurn nurp nurr nuru pdpn pdpr pgdn pgpu pgup pigg pign pigp pigu piip pind ping pini pinn pinp pinu pipi pipp pirg piri pirn pirr piru pnin pnpp pnup ppgi ppid ppig pppd pppn pppp ppru ppur pri- prid prig prii prin prnd prnp prpd prrd prri prud pruu pudu pugu puid puig puin puir puiu pund pung punu pupi pupu pur- purg puri purp purr puru ridd ridi rigg rigi rigu riin rind ring rinn ripd ripi ripp ripr riri rndp rnin rpdp rpii rppn rrrr rrun rudd rudi rudp rugg rugi ruid ruin rund rung runi runn rupp rurd ruri rurp ruru ruud ruun u-rp uddi udid udig udin udir udpd udun ugni ugri ugur uguu uipi uirr undi ungp ungu uni- unii unin unir unni upin upnp uppp uppu upri upup urdu urgi urgu urin uriu urni urri urun urup urur uuni uuri uuuu