bbbb bbci bbin bblb bbrc bcbc bccc bcci bccl bcnu bcru bcuc bibb bibi bibl bicc bici biin bili bill bilu bin- binc bini binn binu birb biri birl birn birr biru blcu blic blin blir blni blrc blub blur bnib bnin bnrr brcb bric bril brin brrr bruc brun bubb bubi bubu bucc buci bucu buic buin buir buiu bulb buli bull bulu bunb buni bunn bunu bur- burb buri burl burn burr buru cbbc cbcc cbcl cbcn cbcr cbcu cbir cblb cblc cbln cbrl cbrn ccbc ccbn cccb cccc ccci cccl cccu ccic ccii ccil ccir cclc ccli ccnb ccnc ccni ccnr ccnu ccrc ccri ccrl ccuc cibc cibi cicc cici cicr cicu ciii cili cill cin- cinc cini cirb circ ciri cirl cirr ciuc clib clic clii clin clir clri club clun cnbc cnbl cnci cnib cnic cnrc cnrr crbc crbu crcc crcr crib cric crin criu crub crun cub- cubb cubi cucc cuci cucn cui- cuil cuin cuir culb culc cull curb curi curl curn curr ibrc ibri icbc iccb iccc icci iccl iccn iccr iccu icll iclr icnb icnc icrc icrr icru icub iiii iirc iiuc ilbc ilic ilin ilir ill- illi ilni incb inci incl incr inni innr innu inri inui inul inun ircc ircu iri- iric iril irin irlb irrc irri irul irun iucc iuiu lbcc lblr lcbc lccc lcrl libc libr libu licr liii liin liir lilb lili lill lilu linc linn lirc liri lirl lirn lirr liru liun llcc lllc llll lncr lric lrrc lrrr luci luin luli lull lulu luni lunn luri n-ii nbbc nbcc nbci nbic ncbc ncbi nccc ncci nccn nccr nccu nclc ncln nclr ncnc ncrc ncri nibi nicc nici nicl nicu niir niiu nili nill nilu nini ninl niru niur nlcc nlic nlrb nnnn nric nrlb nrrc nrrl nubc nubi nubl nuci nucu nuin nuli null nunc nunn nurc nuri nurl nurn nurr nuru rbbb rbbr rbcl rcbc rccb rccc rcic rcnl rcnr rib- ribu ricc riin rill rilu rinn riri rlin rnbr rnin rnli rrrr rrun rubb rubi rubu ruci ruin rull runc runi runn rurc ruri ruru ruun ubbi ubic ubii ubir ubli ucbc ucci ucil ucin ucrc uirr ulbc ulcc ulic ulli ullr ulul uncc unci uncl uni- unic unii unin unir unni urbi urci urib uric urin uriu urni urri urun urur uulu uuni uuri uuuu