-al -ol a-a a-b a-t aaa aab aad aak aal aao aar aat ab- aba abb abd abk abl abo abr abt ad- ada adb add adk adl ado adr adt aka akb akd akk akl ako akr al- ala alb ald alk all alo alr alt aoa aob aod aok aol aoo aor aot ar- ara arb ard ark arl aro arr art at- ata atb atd atl ato atr att baa bab bad bak bal bao bar bat bba bbb bbd bbk bbl bbo bbr bbt bda bdb bdd bdk bdl bdo bdr bdt bka bkb bkk bkl bko bkr bkt bla blb bld blk bll blo blr blt boa bob bod bok bol boo bor bot bra brb brd brk brl bro brr brt bta btb btd btk btl bto btr btt daa dab dad dak dal dao dar dat dba dbb dbd dbk dbl dbo dbr dbt dda ddb ddd ddk ddl ddo ddr ddt dka dkb dkk dkl dko dkr dkt dl- dla dlb dld dlk dll dlo dlr dlt doa dob dod dok dol doo dor dot dra drb drd drk drl dro drr drt dta dtb dtd dtk dtl dto dtr dtt k-t ka- kaa kab kad kak kal kao kar kat kba kbb kbd kbk kbl kbo kbr kda kdb kdk kdl kdo kdr kdt kkb kkk kkl kkr kkt kl- kla klb kld klo klr klt koa kob kod kok kol koo kor kot kra krd krk krl kro krr krt kta ktb ktk ktl kto ktr ktt la- laa lab lad lak lal lao lar lat lba lbb lbd lbk lbl lbo lbr lbt lda ldb ldd ldk ldl ldo ldr ldt lka lkb lkl lkr lkt lla llb lld llk lll llo llr llt loa lob lod lok lol loo lor lot lra lrb lrd lrk lro lrr lrt lta ltb ltd ltk ltl lto ltr ltt oaa oab oad oak oal oao oar oat ob- oba obb obd obk obl obo obr obt oda odb odd odl odo odr odt oka okb okd okk okl oko okr ola olb old olk oll olo olt oo- ooa oob ood ook ool ooo oor oot or- ora orb ord ork orl oro orr ort ot- ota otb otd otk otl oto otr ott ra- raa rab rad rak ral rao rar rat rba rbb rbd rbk rbl rbo rbr rbt rda rdb rdd rdl rdo rdr rdt rkb rkk rko rkt rla rld rll rlo rlr rlt roa rob rod rok rol roo ror rot rra rrb rrd rrk rrl rrr rrt rta rtb rtd rtk rtl rto rtr rtt taa tab tad tak tal tao tar tat tba tbb tbd tbk tbl tbo tbr tbt tda tdb tdd tdk tdl tdo tdr tdt tka tkb tkk tkl tko tkr tkt tla tld tlk tll tlo tlr tlt to- toa tob tod tok tol too tor tot tra trb trd trk trl tro trr trt tta ttb ttd ttk ttl tto ttr ttt