-al -er -ol a-a a-b aaa aab aae aak aal aao aap aar ab- aba abb abe abk abl abo abp abr aea aeb aee aek ael aeo aep aer aka akb ake akk akl ako akp akr al- ala alb ale alk all alo alp alr aoa aob aoe aok aol aoo aop aor ap- apa apb ape apk apl apo app apr ar- ara arb are ark arl aro arp arr b-p baa bab bae bak bal bao bap bar bba bbb bbe bbk bbl bbo bbp bbr be- bea beb bee bek bel beo bep ber bka bkb bke bkk bkl bko bkp bkr bla blb ble blk bll blo blp blr boa bob boe bok bol boo bop bor bpa bpb bpe bpl bpo bpp bpr bra brb bre brk brl bro brp brr eaa eab eae eak eal eao eap ear eba ebb ebe ebk ebl ebo ebp ebr eea eeb eee eek eel eeo eep eer eka ekb eke ekl eko ekp ekr ela elb ele elk ell elo elp elr eo- eoa eob eoe eok eol eoo eop eor ep- epa epb epe epl epo epp epr era erb ere erk erl ero erp err ka- kaa kab kae kak kal kao kap kar kba kbb kbe kbk kbl kbo kbp kbr ke- kea keb kee kek kel keo kep ker kkb kke kkk kkl kkp kkr kl- kla klb klo klr koa kob koe kok kol koo kop kor kpa kpe kpk kpl kpo kpp kpr kra krk krl kro krp krr l-p la- laa lab lae lak lal lao lap lar lba lbb lbe lbk lbl lbo lbp lbr lea leb lee lek lel leo lep ler lka lkb lkl lkp lkr lla llb lle llk lll llo llp llr loa lob loe lok lol loo lop lor lpa lpb lpe lpk lpl lpo lpp lpr lra lrb lrk lro lrp lrr oaa oab oae oak oal oao oap oar ob- oba obb obe obk obl obo obp obr oea oeb oee oel oeo oep oer oka okb oke okk okl oko okp okr ola olb ole olk oll olo olp oo- ooa oob ook ool ooo oop oor op- opa opb ope opk opl opo opp opr or- ora orb ore ork orl oro orp orr p-p paa pab pae pak pal pao pap par pba pbb pbe pbk pbl pbo pbp pbr pea peb pee pek pel peo pep per pka pkb pke pkl pko pkp pkr pla plb ple plk pll plo plp plr poa pob poe pok pol poo pop por ppa ppb ppe ppk ppl ppo ppp ppr pra prb pre prk prl pro prp prr ra- raa rab rae rak ral rao rap rar rba rbb rbe rbk rbl rbo rbp rbr re- rea reb ree rek rel reo rep rer rkb rke rkk rko rkp rla rle rll rlo rlp rlr roa rob roe rok rol roo rop ror rpa rpb rpe rpk rpl rpo rpp rpr rra rrb rrk rrl rrp rrr