-hou dddd ddpo dhod dhol dhor dhpr dhul dhur dod- dodd dodo dohl dohr dold doll dolo dolp dolu dood dool doop door dopo dopp dopr dord doro dorp dorr doru doud doul doup dour dphp dpll dpph drod droh drol drop drou drup druu dudd dudo dudu duhl duhr duhu dull dulo dulu duo- dupo duro duru duul duur hdod hhhh hlod hlul hodh hodr hohl hoho hol- hold holh holl holo holp holu hood hool hoop hoor hopo hopp hord horl horo horr houd houp hour hpdh hrod hrpp hrud hudd hudl hudo hudu huhu huld hull hulu huor hupp hurd hurl huro hurr huru lddp lhhh lhor lldp llll llod lloo llud lodh loho lohr lohu lold loll lolo lood lool loop loor lopp lopu lord loro loud louh loul loup lour louu lpod lppl lprp lrdd lrpu lrrr ludd ludo luhu lull lulu luoh lupo lupu lurd luup oddd odoh odoo odop odor odou odrl odrp odur ohho ohoh oldh ollo olor olph olur ooho oold oolo oooh oooo oord opo- opor oppo ordo ordu orlo orlu oro- oror orph orro orup oudh ould oulu ouph our- ouro ouu- pdpr phlo phoh phoo phrr phul plod ploh ploo plop plou plpp plud plup plur pod- podd podo podu pohl pold poll polo polu pood pooh pool poop poor pop- popo popp poro porr poud poul poup pour pplo ppod pppd pppo pppp ppru ppur prhl prlr pro- prod prol proo prop prou prpd prrd prud pruu pudo pudu puhl pull pulo pulp pulu pupl pupu pur- purl puro purp purr puru rhod rhoh rodd rodo rohl rohr rohu rold roll rolo rolp rood rool roop roor ropo roro roru roud rouh roul roup rpdp rpho rrrr rudd rudl rudo rudp ruhh ruhl ruhr rull rulo rupp rurd ruro rurp ruru ruud u-rp udoh udoo udop udpd uh-d uhoh uhuh uhup ullo ullr ulo- ulul uor- updo uplo upor uppp uppu upup urdu urho uro- urol uroo urpo urrh urup urur uulu uuuu