-al a-a a-b a-c aaa aab aac aak aal aam aar ab- aba abb abc abk abl abm abr ac- aca acb acc ack acl acm acr aka akb akc akk akl akm akr al- ala alb alc alk all alm alr ama amb amc amk aml amm amr ar- ara arb arc ark arl arm arr baa bab bac bak bal bam bar bba bbb bbc bbk bbl bbm bbr bca bcb bcc bck bcl bcm bcr bka bkb bkc bkk bkl bkm bkr bla blb blc blk bll blm blr bma bmb bmc bmk bml bmm bmr bra brb brk brl brm brr c-- caa cab cac cak cal cam car cba cbb cbc cbk cbl cbm cbr cca ccb ccc cck ccl ccm ccr cka ckb ckc ckm cl- cla clb clc clk cll clm clr cma cmb cmc cmk cml cmm cmr cra crb crc crk crl crm crr ka- kaa kab kac kak kal kam kar kba kbb kbc kbk kbl kbm kbr kca kcb kcc kck kcl kcm kcr kkb kkc kkk kkl kkm kkr kl- kla klb klc klm klr kma kmb kmc kmk kml kmm kra krc krk krl krr la- laa lab lac lak lal lam lar lba lbb lbc lbk lbl lbm lbr lca lcb lcc lck lcl lcm lcr lka lkb lkl lkr lla llb llc llk lll llm llr lma lmb lmc lmk lml lmm lmr lra lrb lrc lrk lrm lrr m-r maa mab mac mak mal mam mar mba mbb mbc mbk mbl mbm mbr mc- mca mcb mcc mck mcl mcm mcr mka mkb mkc mkk mkl mkm mkr mla mlb mlc mlk mll mlm mlr mma mmb mmc mmk mml mmm mmr mra mrb mrc mrk mrl mrm mrr ra- raa rab rac rak ral ram rar rba rbb rbc rbk rbl rbm rbr rca rcb rcc rcl rcm rcr rkb rkc rkk rkm rla rlc rll rlm rlr rma rmb rmc rml rmm rmr rra rrb rrc rrk rrl rrm rrr

a-ak aaaa aaab aaac aaal aaam aaar aaba aabb aabc aabl aabm aaca aacb aacc aack aacl aacm aacr aaka aala aalc aall aama aamb aamc aamr aara aarc aarm abaa abab abac abak abal abam abar abb- abba abbb abbr abca abcb abcc abcl abcr abla abma abmb abmc abra abrc acaa acab acac acar acba acbl acca accc accm acla aclc aclr acma acmc acr- acra acrc acrm acrr akaa akal akam akar akca akka akr- akra alaa alac alak alal alam alar alb- alba albc albm alca alcc alk- alka alkb all- alla alll allr alma almc amaa amac amal amam amar amb- amba ambr amca amcc amka amla amm- amma amra amrc amrl arab arac arak aral aram arar arba arc- arca arcm arka arla arma armc arml armm arr- arra arrc arrk arrr baaa baak baal baam baar baba babb babm babr bac- baca bacc back bak- baka bakl bakr bala balc balk ball balm bama bamb bamc baml bamm bar- bara barb barc bark barm barr bbbb bbcm bblb bbrc bcaa bcam bcar bcbc bcca bccc bccl bccm bcma bcra blaa blab blac blak blam blkb blrc bmaa brab brac brak bram brca brcb brka brkb brmc brrm brrr caaa caab caac caal caam caba cac- caca cacc cack cacm cacr caka cala calc calk call calm cama camb camc camk caml camm cara carb carc cark carl carm carr cbac cbal cbar cbbc cbca cbcc cbcl cbcm cbcr cbka cbkl cbkm cbkr cblb cblc cbrl cbrm ccaa ccab ccac ccam ccar ccba ccbc ccca cccb cccc cccl cccm cckm ccla cclc cclm ccma ccmb ccmc ccmm ccra ccrc ccrl ckac ckbc ckck ckcl ckcm cklm ckml ckrc ckrm clab clam clar clra cmaa cmac cmba cmbc cmcc cmla cmll cmmb cmmc cmml cmra cmrr crab crac cram crar crbc crca crcc crcr crkc crkl crmb kaaa kaab kaak kaal kaam kaar kaba kabb kabc kabr kacb kacc kacl kaka kakc kakk kakm kala kalb kalc kalk kall kalm kam- kama kamb kamc kaml kamm kamr kara karb kark karl karm karr kbaa kbab kbac kbak kbal kbam kbar kbba kbbb kbbc kbbk kbbl kbbm kbbr kbca kbcb kbck kbcl kbcr kbkb kbkk kbkl kbkr kbla kblb kbll kblm kblr kbmb kbmc kbmr kbra kbrb kbrc kbrk kbrl kcaa kcab kcac kcal kcam kcar kcba kcbc kcbk kcbl kcbr kcca kccb kccc kcck kccl kccr kckc kckk kckl kckm kckr kcla kclc kclk kcll kclm kclr kcmb kcmc kcmk kcml kcmm kcmr kcrc kcrr kkaa kkac kkal kkam kkar kkba kkbb kkbl kkbr kkcb kkck kkcl kkcm kkcr kkkk kklb kklc kkll kkma kkmc kkmk kkml kkmr kkrb kkrc kkrk kkrl kkrr klaa klab klac klak klal klam klar klbb klbc klbl klbm klca klcb klcc klck klcl klcm klcr klka klkc klkk klkl klkr klla kllb kllc kllk klmk klmm klmr klrc klrk klrm klrr kmac kmak kmal kmam kmbc kmbl kmbr kmca kmcb kmcc kmcl kmcm kmcr kmkk kmkl kmla kmlb kmlk kmmk kmml kmmm kmmr kmrb kmrc kmrr krab krac krak kral kram krar krba krbb krbk krbl krbm krbr krca krcb krcc krcl krcm krka krkc krkk krkr krla krlc krma krmb krmc krml krmr krrb krrc krrk krrl krrm krrr laaa laac laak laal laam laar laba labr laca lacc lack lacl laka lala lall lalm lama lamb lamk lamm lamr lara larb larc lark larm larr lbar lbcc lblr lbmc lcac lcbc lcca lccc lccm lcra lcrl lkab lkal llcc lllc llll lmcc lmmr lrac lral lram lrba lrmc lrrc lrrr maaa maac maak maal maam maar maba mac- maca macb macc mack macr maka mal- mala malk mall malm mama mamc mar- mara marc mark marl marm marr mbac mbam mbba mbca mcaa mcac mcba mcbc mcca mccc mccl mckk mcla mcmc mcml mcrc mkak mlab mlak mlba mlcc mmaa mmab mmac mmar mmcc mmcl mmcm mmmc mmmm mmrc mr-c mrac mrbb mrbm mrca mrcb mrcc mrkr mrmc mrml