-al -ol a-a a-b a-c aaa aab aac aah aak aal aao aar ab- aba abb abc abh abk abl abo abr ac- aca acb acc ach ack acl aco acr aha ahb ahc ahh ahk ahl aho ahr aka akb akc akh akk akl ako akr al- ala alb alc alh alk all alo alr aoa aob aoc aoh aok aol aoo aor ar- ara arb arc arh ark arl aro arr baa bab bac bah bak bal bao bar bba bbb bbc bbh bbk bbl bbo bbr bca bcb bcc bch bck bcl bco bcr bha bhb bhc bhh bhk bhl bho bhr bka bkb bkc bkk bkl bko bkr bla blb blc blh blk bll blo blr boa bob boc boh bok bol boo bor bra brb brh brk brl bro brr c-- caa cab cac cah cak cal cao car cba cbb cbc cbh cbk cbl cbo cbr cca ccb ccc cch cck ccl cco ccr ch- cha chb chc chh chk chl cho chr cka ckb ckc ckh cko cl- cla clb clc clh clk cll clo clr co- coa cob coc coh cok col coo cor cra crb crc crh crk crl cro crr haa hab hac hah hak hal hao har hba hbb hbc hbh hbk hbl hbo hbr hca hcb hcc hch hck hcl hco hcr hha hhb hhc hhh hhk hhl hho hhr hka hkb hkh hkk hkl hko hkr hla hlb hlc hlh hll hlo hlr hoa hob hoc hoh hok hol hoo hor hr- hra hrb hrc hrh hrk hrl hro hrr ka- kaa kab kac kah kak kal kao kar kba kbb kbc kbh kbk kbl kbo kbr kca kcb kcc kch kck kcl kcr kha khh khk kho khr kkb kkc kkh kkk kkl kkr kl- kla klb klc klh klo klr koa kob koc koh kok kol koo kor kra krc krk krl kro krr la- laa lab lac lah lak lal lao lar lba lbb lbc lbh lbk lbl lbo lbr lca lcb lcc lch lck lcl lco lcr lha lhb lhc lhh lhk lho lhr lka lkb lkh lkl lkr lla llb llc llk lll llo llr loa lob loc loh lok lol loo lor lra lrb lrc lrh lrk lro lrr oaa oab oac oah oak oal oao oar ob- oba obb obc obh obk obl obo obr oc- oca ocb occ och ock ocl oco ocr oha ohc ohh ohl oho ohr oka okb okc okk okl oko okr ola olb olc olk oll olo oo- ooa oob ooc ooh ook ool ooo oor or- ora orb orc orh ork orl oro orr ra- raa rab rac rah rak ral rao rar rba rbb rbc rbh rbk rbl rbo rbr rca rcb rcc rch rcl rco rcr rh- rha rhb rhc rhh rhl rho rhr rkb rkc rkk rko rla rlc rlh rll rlo rlr roa rob roc roh rok rol roo ror rra rrb rrc rrh rrk rrl rrr