-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