bbbb bbeb bboy bbrc bbyo bcbc bccc bcec bcer bcor bebb bebe bebo beby beeb beer beey beo- beor berc bere bero berr bery beye bobb bobe bobo boby boce boco boec boee boeo boer boey boob booc booe boor bor- bore boro borr bory boye boyo brcb brce breb brec bree breo brer brey brob broc broe broo bror brrr bry- brye bryo byce byer byob byoc byre c-bo cbbc cbcc cbce cbcr cbec cbee cber cbre cbry ccbc cccb cccc ccee ccob ccoc ccrc ccre cec- cece ceco ceeb ceec ceor cer- cerc cere cero cery cobb cobe cobo coby coce coco coob cor- corb corc core coro corr cory coyo coyr crbc crcc crce crcr cre- creb crec cree creo crob croc croe croo cror croy cry- cryb cryo cybb cybc cybo cyc- cycb cycc cyre cyy- cyyc ebbc ebbo ebbr ebby ebcc eber eboe eboo ebor eboy ebro ecbc ecbe eccb eccc ecce ecco eco- ecrc ecrr eeby eeee eeoc eerc eero eery eore erbb erbe ercc erce ereb erec erer erob eroc eroe eroo errc erre erro eryc erye eyeb eyec eyer eyey eyre eyry eyyr o-eo obbo obby obec ober obey oboe obor oboy obre obro ocbc occc oce ocee ocre ocro ocrr oec- oecc oeec oere oeye oeyo oobe ooby oocr ooer oooo oore oory orbb orbe orbo orby orce orco ore- oreb orec oreo orer orey oro- oroe oror oroy orro orry oyce oyee oyer oyre rbbb rbbr rcbc rcbo rccb rccc rcyc rebb rebe rebo recc rece recr recy reeb rere rero rery reye rob- robb robe robo roby rocc roce roco roer roey roob roor rorc rore roro rory roye rrrr rybe ryeb ryob yber ybor ybry yccc ycee yeer yerb yere yero yerr yery yeye yeyo yeyr yobo yore yoro yory yoye yoyo yyyy