-al -ol a-a a-b a-c aaa aab aac aaf aak aal aao aar ab- aba abb abc abf abk abl abo abr ac- aca acb acc acf ack acl aco acr af- afa afb afc aff afk afl afo afr aka akb akc akk akl ako akr al- ala alb alc alf alk all alo alr aoa aob aoc aof aok aol aoo aor ar- ara arb arc arf ark arl aro arr baa bab bac baf bak bal bao bar bba bbb bbc bbf bbk bbl bbo bbr bca bcb bcc bcf bck bcl bco bcr bfa bfb bfc bff bfl bfo bfr bka bkb bkc bkf bkk bkl bko bkr bla blb blc blf blk bll blo blr boa bob boc bof bok bol boo bor bra brb brf brk brl bro brr c-- caa cab cac caf cak cal cao car cba cbb cbc cbf cbk cbl cbo cbr cca ccb ccc ccf cck ccl cco ccr cfa cfb cfc cff cfk cfl cfo cfr cka ckb ckc cko cl- cla clb clc clf clk cll clo clr co- coa cob coc cof cok col coo cor cra crb crc crf crk crl cro crr faa fab fac faf fak fal fao far fba fbb fbc fbf fbk fbl fbo fbr fca fcb fcc fcf fck fcl fco fcr ffa ffc fff ffk ffl ffo ffr fka fkb fkc fkf fkk fkl fla flb flc flf fll flo flr foa fob foc fof fok fol foo for fra frb frc frf frk frl fro frr ka- kaa kab kac kaf kak kal kao kar kba kbb kbc kbf kbk kbl kbo kbr kca kcb kcc kck kcl kcr kfa kfc kff kfo kkb kkc kkk kkl kkr kl- kla klb klc klf klo klr koa kob koc kof kok kol koo kor kra krc krf krk krl kro krr la- laa lab lac laf lak lal lao lar lba lbb lbc lbf lbk lbl lbo lbr lca lcb lcc lcf lck lcl lco lcr lfa lfb lfc lff lfk lfl lfo lfr lka lkb lkl lkr lla llb llc llf llk lll llo llr loa lob loc lof lok lol loo lor lra lrb lrc lrf lrk lro lrr oaa oab oac oaf oak oal oao oar ob- oba obb obc obf obk obl obo obr oc- oca ocb occ ocf ock ocl oco ocr of- ofa ofb ofc off ofl ofo ofr oka okb okc okk okl oko okr ola olb olc olf olk oll olo oo- ooa oob ooc oof ook ool ooo oor or- ora orb orc orf ork orl oro orr ra- raa rab rac raf rak ral rao rar rba rbb rbc rbf rbk rbl rbo rbr rca rcb rcc rcf rcl rco rcr rfa rfb rfc rff rfk rfl rfo rfr rkb rkc rkf rkk rko rla rlc rlf rll rlo rlr roa rob roc rof rok rol roo ror rra rrb rrc rrf rrk rrl rrr

a-ak a-ok aaaa aaab aaac aaaf aaal aaar aaba aabb aabc aabl aaca aacb aacc aacf aack aacl aaco aacr aafa aafb aafc aaff aafl aaka aala aalc aall aalo aaoo aara aarc aaro abaa abab abac abaf abak abal abar abb- abba abbb abbo abbr abca abcb abcc abcf abcl abcr abff abla ablo aboa abob abof abok abol aboo abor abra abrc abro acaa acab acac acar acba acbl acca accc accf acco acfc acfl acla aclc aclr acoa acol acor acr- acra acrc acro acrr afaa afak afao afar afca afcb afcc affa affc affo afka afkr afla aflc afoa afol afoo afor afr- afra afrc afro akaa akal akao akar akca akka akko aklo akok akr- akra alaa alac alak alal alao alar alb- alba albc albo alca alcc alco alfa alk- alka alkb alko all- alla alll allo allr aloa aloc alof alok alol aloo alor alro aoba aoca aola aora aorb arab arac araf arak aral arar arba arc- arca arco arfa arfb arfc arff arka arko arla arlo aroa arob aroo aror arr- arra arrc arrk arro arrr baaa baaf baak baal baar baba babb babo babr bac- baca bacc back baco bafc baff bafo bak- baka bakl bako bakr bala balc balf balk ball balo baol bar- bara barb barc barf bark baro barr bbbb bbfc bblb bbrc bcaa bcar bcbc bcca bccc bccl bcfc bcof bcor bcra bfca bffl blaa blab blac blak blfc blkb blob bloc blok bloo blrc boab boac boak boal boar boba bobb bobo boca bock boco bofa boff boka boko bola bolk boll bolo boob booc boof book bool boor bor- bora borf bork boro borr brab brac braf brak brao brca brcb brfc brka brkb broa brob broc brok brol broo bror brrr c-bo caaa caab caac caaf caal caba cabf cabo cac- caca cacc cack caco cacr cafa cafb cafc caff cafl caka cala calc calf calk call calo caol caor cara carb carc carf cark carl caro carr cbac cbal cbar cbbc cbca cbcc cbcl cbcr cbfb cbfc cbka cbkl cbko cbkr cblb cblc cbol cbrl ccaa ccab ccac ccaf ccar ccba ccbc ccca cccb cccc cccf cccl ccfa ccfc ccff ccfl ccla cclc ccob ccoc ccra ccrc ccrf ccrl cfaa cfab cfac cfao cfar cfbc cfbr cfca cfcb cfcf cfcl cfco cffb cffr cfoa cfor cfra cfrb ckac ckbc ckck ckcl ckco ckfr cklf ckoa ckob ckoc ckoo ckor ckrc clab claf clar clob clof clok cloo clor clra clro coak coal coba cobb cobo coca cock coco cofc coff cok- coka coko col- cola colb colk coll colo coob coof cook cool cor- cora corb corc corf cork corl coro corr crab crac craf crar crbc crca crcc crcr crfc crfl crkc crkl crlf crob croc crok crol croo cror f--k faaa faac faba fabo faca facc fack fafa fafc faff fafo fako fala falc falk fall falo fara farb farc fark farl faro farr fbar fbla fcab fcal fcar fcba fcca fccf fcra ffar