-al -ol a-a a-b a-c aaa aab aac aah aal aao ab- aba abb abc abh abl abo ac- aca acb acc ach acl aco aha ahb ahc ahh ahl aho al- ala alb alc alh all alo aoa aob aoc aoh aol aoo baa bab bac bah bal bao bba bbb bbc bbh bbl bbo bca bcb bcc bch bcl bco bha bhb bhc bhh bhl bho bla blb blc blh bll blo boa bob boc boh bol boo c-- caa cab cac cah cal cao cba cbb cbc cbh cbl cbo cca ccb ccc cch ccl cco ch- cha chb chc chh chl cho cl- cla clb clc clh cll clo co- coa cob coc coh col coo haa hab hac hah hal hao hba hbb hbc hbh hbl hbo hca hcb hcc hch hcl hco hha hhb hhc hhh hhl hho hla hlb hlc hlh hll hlo hoa hob hoc hoh hol hoo la- laa lab lac lah lal lao lba lbb lbc lbh lbl lbo lca lcb lcc lch lcl lco lha lhb lhc lhh lho lla llb llc lll llo loa lob loc loh lol loo oaa oab oac oah oal oao ob- oba obb obc obh obl obo oc- oca ocb occ och ocl oco oha ohc ohh ohl oho ola olb olc oll olo oo- ooa oob ooc ooh ool ooo