bbbb bbeb bbox bbpr bebb bebe bebo beeb beek beep beer beke beko beo- beok beor bepo bere berk bero berr bkpr bobb bobe bobo boee boeo boep boer boke boko boob booe book boop boor boox bope bopp bor- bore bork boro borr bpoe breb bree brek breo brep brer brex brkb brob broe brok broo bror brox brrr ebbo ebbr eber eboe eboo ebor ebox ebpo ebro eeee eeke eero ekeb ekek eker ekpe ekpo eore epee eper epor epox eppo eppp eprb epro eprp epxp er-x erbb erbe ereb erer erke erob eroe eroo erpe erre erro exer exo- exor expo expr exrx kbbb kbbe kbbk kbbo kbbr kbeb kbee kbek kbeo kber kbex kbkb kbkk kbko kbkr kbob kboe kbok kboo kbox kbpe kbpk kbpo kbpr kbrb kbre kbrk kbro kbrx kbxb kbxr kbxx kebb kebe kebr keek keep keer kekb keke keko keok kep- kepe kepx ker- kerb kere kerk kero kerp kerr kerx kexb kexo kexx kkbb kkbe kkbo kkbr kkex kkkk kkob kkoo kkor kkpk kkrb kkre kkrk kkro kkrr kkrx kkxk kkxx kobb kobe kobk kobo kobr kokb koke kokk koko kokp kokr kokx koob kook kooo koop koor kopb kope kopp kopr korb kore kork koro korr koxe koxr kpbb kpbe kpbr kpbx kpek kper kpke kpkk kpkr kpkx kpob kpoe kpok kpoo kpop kppk kppo kppp kppr kprb kpre kprk kpro kprp kprr kpxp kpxr krbb krbe krbk krbr krbx kreb kree krek kreo krex krke krkk krko krkr krkx krob kroe krok kroo krop kror krox krpr krpx krrb krre krrk krro krrr krrx krxb krxk krxo krxp krxr krxx kxbr kxbx kxeo kxex kxkk kxkx kxok kxoo kxor kxox kxpk kxpo kxpr kxrb kxre kxrk kxro kxrp kxrr kxrx kxxe kxxk kxxo kxxr kxxx o-eo obbo ober obex obkb oboe obok obor obox obre obro oere oker okko okok okor okpe okpo okre okro oobe ooer oooo oore opep oper opex opo- opor oppo orbb orbe orbo ore- oreb orek oreo orer orex orke orko oro- oroe orok oror orpe orro oxep oxer oxo- oxox oxxo pbpk peek peep peer peke pekk peko peor pepe pepo per- pere perk pero perp perr pobo poer poke poko pook poop poor pop- pope popo popp porb pore pork poro porr pper pppo pppp pre- preb pree prek prep prex pro- prob proe proo prop prox rbbb rbbr rebb rebe rebk rebo reeb reek reep reke reko reop repe repo repp repr rere rero rexx rob- robb robe robo roer roke rokk roko rokr roob rook roop roor roox rope ropo rore rork roro roxo rpob rpoe rrrr xbee xbox xeer xeko xer- xero xexe xoro xorp xoxo xper xrep xxxo xxxx