bbbb bbci bbfc bbfn bbin bblb bbrc bcbc bccc bcci bccl bcfc bcnu bcru bcuc bffl bibb bibi bibl bicc bici biff bifi biin bili bill bilu bin- binc bini binn binu birb biri birl birn birr biru blcu blfc blic blin blir blni blrc blub bluf blur bnib bnin bnrr brcb brfc brfu bric bril brin brrr bruc brun bubb bubi bubu bucc buci bucu bufc buff bufr buic buif buin buir buiu bulb buli bull bulu bunb buni bunn bunu bur- burb buri burl burn burr buru cbbc cbcc cbcl cbcn cbcr cbcu cbfb cbfc cbir cblb cblc cbln cbrl cbrn ccbc ccbn cccb cccc cccf ccci cccl cccu ccfc ccff ccfi ccfl ccic ccii ccil ccir cclc ccli ccnb ccnc ccnf ccni ccnr ccnu ccrc ccrf ccri ccrl ccuc cfbc cfbn cfbr cfcb cfcf cfcl cfcn cffb cffr cfln cfnb cfni cfnr cfrb cfrn cfun cibc cibi cicc cici cicr cicu ciff cifl ciii cili cill cin- cinc cinf cini cirb circ ciri cirl cirr ciuc clib clic clif clii clin clir clri club clun cnbc cnbl cnci cnib cnic cnrc cnrr crbc crbu crcc crcr crfc crfl crib cric crif crin criu crlf crub crun cub- cubb cubi cucc cuci cucn cufc cuff cufi cui- cuif cuil cuin cuir culb culc cull curb curf curi curl curn curr fccf fcic fcii fcnl ffcc ffff ffii ffrr ffun ficc fifc fiff fifi fiii fiil fili fill filn fini finn firn flcl flic flii flin flnb flnc flub fluf flur fnci fnlc fnuf frbc frcc frcn frfc frib fric fril frin frub frun fubb fubu fuc- fuci fufc fuff fufu fuil fuir fuli full fulu funf fur- furi furl furn furr ibfi ibrc ibri icbc iccb iccc iccf icci iccl iccn iccr iccu icfb icll iclr icnb icnc icrc icrf icrr icru icub ifbb ific ifil ifni ifnr ifrb ifrf ifri iiii iirc iiuc ilbc ilic ilin ilir ill- illi ilni incb inci incl incr infi infl inni innr innu inri inui inul inun ircc ircu irfu iri- iric iril irin irlb irrc irri irul irun iucc iuiu lbcc lblr lcbc lccc lcfc lcfr lcrl lfcc libc libr libu licr liff lifl liii liin liir lilb lili lill lilu linc linn lirc liri lirl lirn lirr liru liuf liun llcc lllc llll lncr lrfc lric lrif lrrc lrrr luci luff lufu luif luin luli lull lulu luni lunn luri n-ii nbbc nbcc nbci nbfc nbfl nbic nbuf ncbc ncbi nccc nccf ncci nccn nccr nccu ncfc nclc ncln nclr ncnc ncrc ncri nfcu nfff nfib nfic nibi nicc nicf nici nicl nicu nifc niff niir niiu nili nill nilu nini ninl niru niur nlcc nlcf nlic nlrb nnnn nrfc nric nrlb nrrc nrrl nubc nubi nubl nuci nucu nuff nuin nuli null nunc nunn nurc nuri nurl nurn nurr nuru rbbb rbbr rbcl rcbc rccb rccc rcfc rcic rcnl rcnr rffc rffl rfic rib- ribu ricc riff rifu riif riin rill rilu rinf rinn riri rlif rlin rnbr rnin rnli rrfc rrif rrrr rrun rubb rubi rubu ruci rufc ruff ruif ruin rull runc runf runi runn rurc ruri ruru ruun ubbi ubic ubii ubir ubli ucbc ucci ucfb ucil ucin ucrc ufcu uirr ulbc ulcc ulic ulli ullr ulul uncc uncf unci uncl uni- unic unif unii unin unir unlf unni unrf urbi urci urff urfi urib uric urif urin uriu urni urri urun urur uulu uuni uuri uuuu