-al -ol a-a a-b aaa aab aae aal aao ab- aba abb abe abl abo aea aeb aee ael aeo al- ala alb ale all alo aoa aob aoe aol aoo baa bab bae bal bao bba bbb bbe bbl bbo be- bea beb bee bel beo bla blb ble bll blo boa bob boe bol boo eaa eab eae eal eao eba ebb ebe ebl ebo eea eeb eee eel eeo ela elb ele ell elo eo- eoa eob eoe eol eoo la- laa lab lae lal lao lba lbb lbe lbl lbo lea leb lee lel leo lla llb lle lll llo loa lob loe lol loo oaa oab oae oal oao ob- oba obb obe obl obo oea oeb oee oel oeo ola olb ole oll olo oo- ooa oob ool ooo