nric nrlb nrrc nrrl nubc nube nubi nubl nuce nuci nucu nuee nuel nuer nuin nule nuli null nunc nune nung nunn nurc nure nuri nurl nurn nurr nuru rbbb rbbr rbcl rble rcbc rccb rccc rcgc rcic rcle rcnl rcnr rcrg rebb rebe rebu recc rece reci recr recu reeb reel reen rege regi regl regn regr regu reii reil rein reir reiu relb rele rell rene reng reni renn renu rere rerg reri reru reue reul reuu rgbe rgbi rib- ribe ribu ricc rice riel rien rier rieu rige rigg rigi rigu riin rile rill rilu rine ring rinn rire riri riue rlcg rlee rleu rlin rlug rnbr rnie rnin rnli rrle rrrr rrun rubb rube rubi rubu ruce ruci ruel ruen ruer ruge rugg rugi ruin rule rull runc rune rung runi runn rurc rure ruri ruru ruun u-ie ubbe ubbi uber ubic ubii ubir uble ubli ucbc ucci ucel ucil ucin ucrc uein ueir uele ueli uell ugcc ugcg ugli ugne ugni ugri ugur uguu uige uile uirr ulbc ulcc uleb ulee ulen ulic ulie ulle ulli ullr ulne ulul unbe uncc unce uncg unci uncl uneb unec unee unen uner ungu uni- unic unie unii unin unir unle unne unni urbe urbi urci ure- urge urgi urgu urib uric urie urin uriu urle urne urni urre urri urun urur uuen uulu uuni uuri uuuu