-al -ol a-a a-b aaa aab aae aal aao aap ab- aba abb abe abl abo abp aea aeb aee ael aeo aep al- ala alb ale all alo alp aoa aob aoe aol aoo aop ap- apa apb ape apl apo app b-p baa bab bae bal bao bap bba bbb bbe bbl bbo bbp be- bea beb bee bel beo bep bla blb ble bll blo blp boa bob boe bol boo bop bpa bpb bpe bpl bpo bpp eaa eab eae eal eao eap eba ebb ebe ebl ebo ebp eea eeb eee eel eeo eep ela elb ele ell elo elp eo- eoa eob eoe eol eoo eop ep- epa epb epe epl epo epp l-p la- laa lab lae lal lao lap lba lbb lbe lbl lbo lbp lea leb lee lel leo lep lla llb lle lll llo llp loa lob loe lol loo lop lpa lpb lpe lpl lpo lpp oaa oab oae oal oao oap ob- oba obb obe obl obo obp oea oeb oee oel oeo oep ola olb ole oll olo olp oo- ooa oob ool ooo oop op- opa opb ope opl opo opp p-p paa pab pae pal pao pap pba pbb pbe pbl pbo pbp pea peb pee pel peo pep pla plb ple pll plo plp poa pob poe pol poo pop ppa ppb ppe ppl ppo ppp