-al -ol a-a a-b aaa aab aae aal aao aas ab- aba abb abe abl abo abs aea aeb aee ael aeo aes al- ala alb ale all alo als aoa aob aoe aol aoo aos as- asa asb ase asl aso ass baa bab bae bal bao bas bba bbb bbe bbl bbo bbs be- bea beb bee bel beo bes bla blb ble bll blo bls boa bob boe bol boo bos bsa bsb bse bsl bso bss eaa eab eae eal eao eas eba ebb ebe ebl ebo ebs eea eeb eee eel eeo ees ela elb ele ell elo els eo- eoa eob eoe eol eoo eos es- esa esb ese esl eso ess la- laa lab lae lal lao las lba lbb lbe lbl lbo lbs lea leb lee lel leo les lla llb lle lll llo lls loa lob loe lol loo los lsa lsb lse lsl lso lss oaa oab oae oal oao oas ob- oba obb obe obl obo obs oea oeb oee oel oeo oes ola olb ole oll olo ols oo- ooa oob ool ooo oos os- osa osb ose osl oso oss saa sab sae sal sao sas sba sbb sbe sbl sbo sbs se- sea seb see sel seo ses sla slb sle sll slo sls soa sob soe sol soo sos ss- ssa ssb sse ssl sso sss