-al -ol a-a a-b a-c aaa aab aac aak aal aam aao aar ab- aba abb abc abk abl abm abo abr ac- aca acb acc ack acl acm aco acr aka akb akc akk akl akm ako akr al- ala alb alc alk all alm alo alr ama amb amc amk aml amm amo amr aoa aob aoc aok aol aom aoo aor ar- ara arb arc ark arl arm aro arr baa bab bac bak bal bam bao bar bba bbb bbc bbk bbl bbm bbo bbr bca bcb bcc bck bcl bcm bco bcr bka bkb bkc bkk bkl bkm bko bkr bla blb blc blk bll blm blo blr bma bmb bmc bmk bml bmm bmo bmr boa bob boc bok bol bom boo bor bra brb brk brl brm bro brr c-- caa cab cac cak cal cam cao car cba cbb cbc cbk cbl cbm cbo cbr cca ccb ccc cck ccl ccm cco ccr cka ckb ckc ckm cko cl- cla clb clc clk cll clm clo clr cma cmb cmc cmk cml cmm cmo cmr co- coa cob coc cok col com coo cor cra crb crc crk crl crm cro crr ka- kaa kab kac kak kal kam kao kar kba kbb kbc kbk kbl kbm kbo kbr kca kcb kcc kck kcl kcm kcr kkb kkc kkk kkl kkm kkr kl- kla klb klc klm klo klr kma kmb kmc kmk kml kmm kmo koa kob koc kok kol kom koo kor kra krc krk krl kro krr la- laa lab lac lak lal lam lao lar lba lbb lbc lbk lbl lbm lbo lbr lca lcb lcc lck lcl lcm lco lcr lka lkb lkl lkr lla llb llc llk lll llm llo llr lma lmb lmc lmk lml lmm lmo lmr loa lob loc lok lol lom loo lor lra lrb lrc lrk lrm lro lrr m-o m-r maa mab mac mak mal mam mao mar mba mbb mbc mbk mbl mbm mbo mbr mc- mca mcb mcc mck mcl mcm mco mcr mka mkb mkc mkk mkl mkm mko mkr mla mlb mlc mlk mll mlm mlo mlr mma mmb mmc mmk mml mmm mmo mmr moa mob moc mok mol mom moo mor mra mrb mrc mrk mrl mrm mro mrr oaa oab oac oak oal oam oao oar ob- oba obb obc obk obl obm obo obr oc- oca ocb occ ock ocl ocm oco ocr oka okb okc okk okl oko okr ola olb olc olk oll olm olo om- oma omb omc oml omm omo omr oo- ooa oob ooc ook ool oom ooo oor or- ora orb orc ork orl orm oro orr ra- raa rab rac rak ral ram rao rar rba rbb rbc rbk rbl rbm rbo rbr rca rcb rcc rcl rcm rco rcr rkb rkc rkk rkm rko rla rlc rll rlm rlo rlr rma rmb rmc rml rmm rmo rmr roa rob roc rok rol rom roo ror rra rrb rrc rrk rrl rrm rrr