-al a-a a-b a-c aaa aab aac aah aal ab- aba abb abc abh abl ac- aca acb acc ach acl aha ahb ahc ahh ahl al- ala alb alc alh all baa bab bac bah bal bba bbb bbc bbh bbl bca bcb bcc bch bcl bha bhb bhc bhh bhl bla blb blc blh bll c-- caa cab cac cah cal cba cbb cbc cbh cbl cca ccb ccc cch ccl ch- cha chb chc chh chl cl- cla clb clc clh cll haa hab hac hah hal hba hbb hbc hbh hbl hca hcb hcc hch hcl hha hhb hhc hhh hhl hla hlb hlc hlh hll la- laa lab lac lah lal lba lbb lbc lbh lbl lca lcb lcc lch lcl lha lhb lhc lhh lla llb llc lll