bbbb bbin bbpr bibb bibi biin bin- bini binn bint binu bipp bipu birb biri birn birr birt biru bitt bitu bnib bnin bnpp bnrr bpti brin brit brrr brun brup brut btbp btrt bttb bubb bubi bubu buin buir buit buiu bunb buni bunn bunt bunu bur- burb buri burn burp burr burt buru but- buti butt ibri ibtb iiii iiit iitr iitt init inni innr innu inp- inpi inpp inpt inri inti intn intp intr intu inui inun inup ipin ippr ipri ipur iput irbp iri- irin irip irri irti irtp irun itin itri itup itur iuiu iupp n-ii n-up nbpp nbti nibi niip niir niit niiu nini nipr nipt nirt niru nitb niti nitr niur nnit nnnn nnpi nnpr nntn npin npri nprt nptn nrpn ntnu ntru nttr ntui nubi nuin nuit nunn nunt nuri nurn nurp nurr nurt nuru nutt nutu pibb pibi piip pini pinn pinp pint pinu pipi pipp piri pirn pirr piru piti pitr pitt pitu pnin pnpp pntr pnup ppib pppn pppp ppru pptn pptt ppur pri- prii prin prnp prri prti prtp prtr prut pruu ptui pubu puin puir puit puiu punt punu pupi pupu pur- purb puri purp purr puru put- puti putt putu rbbb rbbr rib- ribu riin rinn ripi ripp ripr ript riri riti ritt ritu rnbr rnin rnnt rntp rnut rpii rppn rptn rrrr rrun rttp rubb rubi rubp rubu ruin ruit runi runn runt rupp rupt ruri rurp ruru ruti rutt rutu ruun tbit tbrb tbtp tibi tibu tiit tiiu tini tinn tint tinu tip- tipi tipp tipt tipu tirb tiri tirr tiru titi titp titt titu tnut tpir tppp tppr tptp tptr tput tri- trib trin trip trit trpn trpp trtr trub trun trut truu ttbb tttt tubb tubr tubu tuin tuit tuiu tunb tuni tunn tunu tupi tupu turb turi turn turp turr turt turu tuti tutt tutu u-rp ubbi ubii ubir ubit uint uipi uirr uni- unii unin unir unit unni untb unut upin upnp uppp uppu upri upup urbi urib urin uriu urni urri urun urup urur urut utin utri utti uttu uuni uuri uuuu