-al -ol a-a a-b aaa aab aal aao aau ab- aba abb abl abo abu al- ala alb all alo alu aoa aob aol aoo aou au- aua aub aul auo b-u baa bab bal bao bau bba bbb bbl bbo bbu bla blb bll blo blu boa bob bol boo bou bua bub bul buo buu la- laa lab lal lao lau lba lbb lbl lbo lbu lla llb lll llo llu loa lob lol loo lou lua lub lul luo luu oaa oab oal oao oau ob- oba obb obl obo obu ola olb oll olo olu oo- ooa oob ool ooo ou- oua oul ouo ua- uaa uab ual uao uau uba ubb ubl ubo ubu ula ulb ull ulo ulu uoa uob uol uoo uua uuu