bbbb bbeb bbpr bbrc bcbc bcbp bccc bcec bcer bcor bcpp bebb bebe bebo beeb beep beer beo- beor bepo berc bere bero berr bobb bobe bobo boce boco boec boee boeo boep boer boob booc booe boop boor bope bopp bor- bore boro borr bpcp bpoe bprc brcb brce breb brec bree breo brep brer brob broc broe broo bror brrr c-bo cbbc cbcc cbce cbcp cbcr cbec cbee cber cbpc cbpp cbre ccbc cccb cccc cccp ccee ccob ccoc ccpe ccpp ccpr ccrc ccre ccrp cebp cec- cece ceco cecp ceeb ceec ceop ceor cepc cepe cepo cepp cepr cer- cerc cere cero cerp cobb cobe cobo coce coco cocp coep coob coop cope copo copp copr cor- corb corc core coro corp corr cpbc cpce cpeb cpep cper cpre crbc crcc crce crcr cre- creb crec cree creo crep crob croc croe croo crop cror crpc ebbc ebbo ebbr ebcc eber eboe eboo ebor ebpo ebro ecbc ecbe eccb eccc ecce ecco eco- ecop ecpp ecrc ecrr eeee eeoc eerc eero eore epcc epec epee eper epoc epor eppc eppo eppp eprb epro eprp erbb erbe ercc erce ercp ereb erec erer erob eroc eroe eroo erpe errc erre erro o-eo obbo obec ober oboe obor obre obro ocbc occc oce ocee ocpp ocre ocro ocrr oec- oecc oeec oere oobe oocr ooer oooo oore opec opep oper opo- opor oppo orbb orbe orbo orce orco ore- oreb orec oreo orer oro- oroe oror orpc orpe orro pbcc pboc pcbc pccc pcce pcep pcer pcoe pcpb pcpp pcrc pcre pece peco pecr peec peep peer peor pepe pepo per- perc pere pero perp perr pobo poce poco poer poop poor pop- popc pope popo popp porb porc pore poro porr ppcc pper pppo pppp pprc prbc prcc prcp pre- preb prec pree prep pro- prob proc proe proo prop rbbb rbbr rcbc rcbo rccb rccc rcep rcpo rebb rebe rebo recc rece recp recr reeb reep reop repe repo repp repr rere rero rob- robb robe robo rocc roce roco roer roob roop roor rope ropo rorc rore roro rpob rpoe rrrr