-al -ol a-a a-b a-c aaa aab aac aaf aak aal aam aao aar ab- aba abb abc abf abk abl abm abo abr ac- aca acb acc acf ack acl acm aco acr af- afa afb afc aff afk afl afm afo afr aka akb akc akk akl akm ako akr al- ala alb alc alf alk all alm alo alr ama amb amc amf amk aml amm amo amr aoa aob aoc aof aok aol aom aoo aor ar- ara arb arc arf ark arl arm aro arr baa bab bac baf bak bal bam bao bar bba bbb bbc bbf bbk bbl bbm bbo bbr bca bcb bcc bcf bck bcl bcm bco bcr bfa bfb bfc bff bfl bfm bfo bfr bka bkb bkc bkf bkk bkl bkm bko bkr bla blb blc blf blk bll blm blo blr bma bmb bmc bmf bmk bml bmm bmo bmr boa bob boc bof bok bol bom boo bor bra brb brf brk brl brm bro brr c-- caa cab cac caf cak cal cam cao car cba cbb cbc cbf cbk cbl cbm cbo cbr cca ccb ccc ccf cck ccl ccm cco ccr cfa cfb cfc cff cfk cfl cfm cfo cfr cka ckb ckc ckm cko cl- cla clb clc clf clk cll clm clo clr cma cmb cmc cmf cmk cml cmm cmo cmr co- coa cob coc cof cok col com coo cor cra crb crc crf crk crl crm cro crr faa fab fac faf fak fal fam fao far fba fbb fbc fbf fbk fbl fbm fbo fbr fca fcb fcc fcf fck fcl fcm fco fcr ffa ffc fff ffk ffl ffm ffo ffr fka fkb fkc fkf fkk fkl fkm fla flb flc flf fll flm flo flr fma fmb fmc fmf fml fmm fmo fmr foa fob foc fof fok fol fom foo for fra frb frc frf frk frl frm fro frr ka- kaa kab kac kaf kak kal kam kao kar kba kbb kbc kbf kbk kbl kbm kbo kbr kca kcb kcc kck kcl kcm kcr kfa kfc kff kfm kfo kkb kkc kkk kkl kkm kkr kl- kla klb klc klf klm klo klr kma kmb kmc kmf kmk kml kmm kmo koa kob koc kof kok kol kom koo kor kra krc krf krk krl kro krr la- laa lab lac laf lak lal lam lao lar lba lbb lbc lbf lbk lbl lbm lbo lbr lca lcb lcc lcf lck lcl lcm lco lcr lfa lfb lfc lff lfk lfl lfm lfo lfr lka lkb lkl lkr lla llb llc llf llk lll llm llo llr lma lmb lmc lmf lmk lml lmm lmo lmr loa lob loc lof lok lol lom loo lor lra lrb lrc lrf lrk lrm lro lrr m-f m-o m-r maa mab mac maf mak mal mam mao mar mba mbb mbc mbf mbk mbl mbm mbo mbr mc- mca mcb mcc mcf mck mcl mcm mco mcr mfa mfb mfc mff mfl mfm mfo mfr mka mkb mkc mkk mkl mkm mko mkr mla mlb mlc mlf mlk mll mlm mlo mlr mma mmb mmc mmf mmk mml mmm mmo mmr moa mob moc mof mok mol mom moo mor mra mrb mrc mrf mrk mrl mrm mro mrr oaa oab oac oaf oak oal oam oao oar ob- oba obb obc obf obk obl obm obo obr oc- oca ocb occ ocf ock ocl ocm oco ocr of- ofa ofb ofc off ofl ofm ofo ofr oka okb okc okk okl oko okr ola olb olc olf olk oll olm olo om- oma omb omc omf oml omm omo omr oo- ooa oob ooc oof ook ool oom ooo oor or- ora orb orc orf ork orl orm oro orr ra- raa rab rac raf rak ral ram rao rar rba rbb rbc rbf rbk rbl rbm rbo rbr rca rcb rcc rcf rcl rcm rco rcr rfa rfb rfc rff rfk rfl rfm rfo rfr rkb rkc rkf rkk rkm rko rla rlc rlf rll rlm rlo rlr rma rmb rmc rmf rml rmm rmo rmr roa rob roc rof rok rol rom roo ror rra rrb rrc rrf rrk rrl rrm rrr

a-ak a-ok aaaa aaab aaac aaaf aaal aaam aaar aaba aabb aabc aabl aabm aaca aacb aacc aacf aack aacl aacm aaco aacr aafa aafb aafc aaff aafl aaka aala aalc aall aalo aama aamb aamc aamo aamr aaoo aara aarc aarm aaro abaa abab abac abaf abak abal abam abar abb- abba abbb abbo abbr abca abcb abcc abcf abcl abcr abff abla ablo abma abmb abmc aboa abob abof abok abol aboo abor abra abrc abro acaa acab acac acar acba acbl acca accc accf accm acco acfc acfl acfm acla aclc aclr acma acmc acmf acoa acol acom acor acr- acra acrc acrm acro acrr afaa afak afam afao afar afca afcb afcc affa affc affo afka afkr afla aflc afma afmc afoa afol afoo afor afr- afra afrc afrm afro akaa akal akam akao akar akca akka akko aklo akok akom akr- akra alaa alac alak alal alam alao alar alb- alba albc albm albo alca alcc alco alfa alk- alka alkb alko all- alla alll allo allr alma almc almo aloa aloc alof alok alol alom aloo alor alro amaa amac amal amam amar amb- amba ambo ambr amca amcc amco amfm amfr amka amla amm- amma ammo amob amoc amof amok amol amoo amor amra amrc amrl amro aoba aoca aola aoma aora aorb arab arac araf arak aral aram arar arba arc- arca arcm arco arfa arfb arfc arff arka arko arla arlo arma armc arml armm armo aroa arob arom aroo aror arr- arra arrc arrk arro arrr baaa baaf baak baal baam baar baba babb babm babo babr bac- baca bacc back baco bafc baff bafo bak- baka bakl bako bakr bala balc balf balk ball balm balo bama bamb bamc bamf