-al -ol a-a a-b aaa aab aae aah aal aao ab- aba abb abe abh abl abo aea aeb aee aeh ael aeo aha ahb ahe ahh ahl aho al- ala alb ale alh all alo aoa aob aoe aoh aol aoo baa bab bae bah bal bao bba bbb bbe bbh bbl bbo be- bea beb bee beh bel beo bha bhb bhe bhh bhl bho bla blb ble blh bll blo boa bob boe boh bol boo eaa eab eae eah eal eao eba ebb ebe ebh ebl ebo eea eeb eee eel eeo eha ehb ehe ehh ehl eho ela elb ele elh ell elo eo- eoa eob eoe eoh eol eoo haa hab hae hah hal hao hba hbb hbe hbh hbl hbo he- hea heb hee heh hel heo hha hhb hhe hhh hhl hho hla hlb hle hlh hll hlo hoa hob hoe hoh hol hoo la- laa lab lae lah lal lao lba lbb lbe lbh lbl lbo lea leb lee leh lel leo lha lhb lhh lho lla llb lle lll llo loa lob loe loh lol loo oaa oab oae oah oal oao ob- oba obb obe obh obl obo oea oeb oee oeh oel oeo oha ohe ohh ohl oho ola olb ole oll olo oo- ooa oob ooh ool ooo