-al -er -ol a-a a-b a-t aaa aab aae aak aal aao aar aat ab- aba abb abe abk abl abo abr abt aea aeb aee aek ael aeo aer aet aka akb ake akk akl ako akr al- ala alb ale alk all alo alr alt aoa aob aoe aok aol aoo aor aot ar- ara arb are ark arl aro arr art at- ata atb ate atl ato atr att baa bab bae bak bal bao bar bat bba bbb bbe bbk bbl bbo bbr bbt be- bea beb bee bek bel beo ber bet bka bkb bke bkk bkl bko bkr bkt bla blb ble blk bll blo blr blt boa bob boe bok bol boo bor bot bra brb bre brk brl bro brr brt bta btb bte btk btl bto btr btt eaa eab eae eak eal eao ear eat eba ebb ebe ebk ebl ebo ebr ebt eea eeb eee eek eel eeo eer eet eka ekb eke ekl eko ekr ekt ela elb ele elk ell elo elr elt eo- eoa eob eoe eok eol eoo eor eot era erb ere erk erl ero err ert eta etb ete etk etl eto etr ett k-t ka- kaa kab kae kak kal kao kar kat kba kbb kbe kbk kbl kbo kbr ke- kea keb kee kek kel keo ker ket kkb kke kkk kkl kkr kkt kl- kla klb klo klr klt koa kob koe kok kol koo kor kot kra krk krl kro krr krt kta ktb kte ktk ktl kto ktr ktt la- laa lab lae lak lal lao lar lat lba lbb lbe lbk lbl lbo lbr lbt lea leb lee lek lel leo ler let lka lkb lkl lkr lkt lla llb lle llk lll llo llr llt loa lob loe lok lol loo lor lot lra lrb lrk lro lrr lrt lta ltb lte ltk ltl lto ltr ltt oaa oab oae oak oal oao oar oat ob- oba obb obe obk obl obo obr obt oea oeb oee oel oeo oer oet oka okb oke okk okl oko okr ola olb ole olk oll olo olt oo- ooa oob ook ool ooo oor oot or- ora orb ore ork orl oro orr ort ot- ota otb ote otk otl oto otr ott ra- raa rab rae rak ral rao rar rat rba rbb rbe rbk rbl rbo rbr rbt re- rea reb ree rek rel reo rer ret rkb rke rkk rko rkt rla rle rll rlo rlr rlt roa rob roe rok rol roo ror rot rra rrb rrk rrl rrr rrt rta rtb rte rtk rtl rto rtr rtt taa tab tae tak tal tao tar tat tba tbb tbe tbk tbl tbo tbr tbt te- tea teb tee tek tel teo ter tet tka tkb tke tkk tkl tko tkr tkt tla tle tlk tll tlo tlr tlt to- toa tob toe tok tol too tor tot tra trb tre trk trl tro trr trt tta ttb tte ttk ttl tto ttr ttt