-al -ol a-a a-b aaa aab aae aak aal aao aas ab- aba abb abe abk abl abo abs aea aeb aee aek ael aeo aes aka akb ake akk akl ako aks al- ala alb ale alk all alo als aoa aob aoe aok aol aoo aos as- asa asb ase ask asl aso ass baa bab bae bak bal bao bas bba bbb bbe bbk bbl bbo bbs be- bea beb bee bek bel beo bes bka bkb bke bkk bkl bko bks bla blb ble blk bll blo bls boa bob boe bok bol boo bos bsa bsb bse bsk bsl bso bss eaa eab eae eak eal eao eas eba ebb ebe ebk ebl ebo ebs eea eeb eee eek eel eeo ees eka ekb eke ekl eko eks ela elb ele elk ell elo els eo- eoa eob eoe eok eol eoo eos es- esa esb ese esk esl eso ess ka- kaa kab kae kak kal kao kas kba kbb kbe kbk kbl kbo kbs ke- kea keb kee kek kel keo kes kkb kke kkk kkl kks kl- kla klb klo kls koa kob koe kok kol koo kos ksa ksb kse ksk ksl kso kss la- laa lab lae lak lal lao las lba lbb lbe lbk lbl lbo lbs lea leb lee lek lel leo les lka lkb lkl lks lla llb lle llk lll llo lls loa lob loe lok lol loo los lsa lsb lse lsk lsl lso lss oaa oab oae oak oal oao oas ob- oba obb obe obk obl obo obs oea oeb oee oel oeo oes oka okb oke okk okl oko oks ola olb ole olk oll olo ols oo- ooa oob ook ool ooo oos os- osa osb ose osk osl oso oss saa sab sae sak sal sao sas sba sbb sbe sbk sbl sbo sbs se- sea seb see sek sel seo ses sk- ska skb ske skk skl sko sks sla slb sle slk sll slo sls soa sob soe sok sol soo sos ss- ssa ssb sse ssk ssl sso sss