bbbb bbci bblb bbrc bcbc bccc bcci bccl bcru bcuc bibb bibi bibl bicc bici bili bill bilu birb biri birl birr biru blcu blic blir blrc blub blur brcb bric bril brrr bruc bubb bubi bubu bucc buci bucu buic buir buiu bulb buli bull bulu bur- burb buri burl burr buru cbbc cbcc cbcl cbcr cbcu cbir cblb cblc cbrl ccbc cccb cccc ccci cccl cccu ccic ccii ccil ccir cclc ccli ccrc ccri ccrl ccuc cibc cibi cicc cici cicr cicu ciii cili cill cirb circ ciri cirl cirr ciuc clib clic clii clir clri club crbc crbu crcc crcr crib cric criu crub cub- cubb cubi cucc cuci cui- cuil cuir culb culc cull curb curi curl curr ibrc ibri icbc iccb iccc icci iccl iccr iccu icll iclr icrc icrr icru icub iiii iirc iiuc ilbc ilic ilir ill- illi ircc ircu iri- iric iril irlb irrc irri irul iucc iuiu lbcc lblr lcbc lccc lcrl libc libr libu licr liii liir lilb lili lill lilu lirc liri lirl lirr liru llcc lllc llll lric lrrc lrrr luci luli lull lulu luri rbbb rbbr rbcl rcbc rccb rccc rcic rib- ribu ricc rill rilu riri rrrr rubb rubi rubu ruci rull rurc ruri ruru ubbi ubic ubii ubir ubli ucbc ucci ucil ucrc uirr ulbc ulcc ulic ulli ullr ulul urbi urci urib uric uriu urri urur uulu uuri uuuu