-al -ol a-a a-b aaa aab aad aak aal aao aar ab- aba abb abd abk abl abo abr ad- ada adb add adk adl ado adr aka akb akd akk akl ako akr al- ala alb ald alk all alo alr aoa aob aod aok aol aoo aor ar- ara arb ard ark arl aro arr baa bab bad bak bal bao bar bba bbb bbd bbk bbl bbo bbr bda bdb bdd bdk bdl bdo bdr bka bkb bkk bkl bko bkr bla blb bld blk bll blo blr boa bob bod bok bol boo bor bra brb brd brk brl bro brr daa dab dad dak dal dao dar dba dbb dbd dbk dbl dbo dbr dda ddb ddd ddk ddl ddo ddr dka dkb dkk dkl dko dkr dl- dla dlb dld dlk dll dlo dlr doa dob dod dok dol doo dor dra drb drd drk drl dro drr ka- kaa kab kad kak kal kao kar kba kbb kbd kbk kbl kbo kbr kda kdb kdk kdl kdo kdr kkb kkk kkl kkr kl- kla klb kld klo klr koa kob kod kok kol koo kor kra krd krk krl kro krr la- laa lab lad lak lal lao lar lba lbb lbd lbk lbl lbo lbr lda ldb ldd ldk ldl ldo ldr lka lkb lkl lkr lla llb lld llk lll llo llr loa lob lod lok lol loo lor lra lrb lrd lrk lro lrr oaa oab oad oak oal oao oar ob- oba obb obd obk obl obo obr oda odb odd odl odo odr oka okb okd okk okl oko okr ola olb old olk oll olo oo- ooa oob ood ook ool ooo oor or- ora orb ord ork orl oro orr ra- raa rab rad rak ral rao rar rba rbb rbd rbk rbl rbo rbr rda rdb rdd rdl rdo rdr rkb rkk rko rla rld rll rlo rlr roa rob rod rok rol roo ror rra rrb rrd rrk rrl rrr