bbbb bbeb bbrc bcbc bccc bcec bcer bebb bebe beck beeb beek beer beke berc bere berk berr brcb brce breb brec bree brek brer brev brkb brrr cbbc cbcc cbce cbcr cbec cbee cber cbkr cbre cbvb cbve cbvr ccbc cccb cccc cccv ccee ccrc ccre cec- cece ceeb ceec ceke cer- cerc cere ckbc ckbe ckck ckcv cker ckrc crbc crcc crce crcr cre- creb crec cree crkc cvcc cver cvrr ebbc ebbr ebcc eber ecbc ecbe eccb eccc ecce ecrc ecrr ecrv eeee eeke eerc ekeb ekek eker erbb erbe ercc erce ereb erec erer erev erke errc erre erve ever evre evvk kbbb kbbc kbbe kbbk kbbr kbcb kbce kbck kbcr kbeb kbec kbee kbek kber kbev kbkb kbkk kbkr kbkv kbrb kbrc kbre kbrk kbrv kbvb kbvc kbvr kcbc kcbk kcbr kccb kccc kcck kccr kccv kceb kcec kcee kckc kckk kckr kckv kcrc kcrr kcrv kcvk kcvr kcvv kebb kebc kebe kebr keck kecr keek keer kekb kekc keke ker- kerb kerc kere kerk kerr kerv keve kkbb kkbe kkbr kkcb kkck kkcr kkkk kkrb kkrc kkre kkrk kkrr kkrv kkvr kkvv krbb krbe krbk krbr krcb krcc krce kreb krec kree krek krev krkc krke krkk krkr krkv krrb krrc krre krrk krrr krvb krvc krve krvk krvr krvv kvbc kvbr kvcb kvcc kvce kvck kvcr kvcv kvec kver kvrc kvre kvrr kvrv kvvr kvvv rbbb rbbr rcbc rccb rccc rcvr rebb rebe rebk recc rece reck recr reeb reek reev reke rere reve rrrr rv-c rver vbcc vecc veck veer veke ver- verb vere verk veve vver vvvv