-al a-a a-b a-c aaa aab aac aaf aah aal ab- aba abb abc abf abh abl ac- aca acb acc acf ach acl af- afa afb afc aff afh afl aha ahb ahc ahf ahh ahl al- ala alb alc alf alh all baa bab bac baf bah bal bba bbb bbc bbf bbh bbl bca bcb bcc bcf bch bcl bfa bfb bfc bff bfh bfl bha bhb bhc bhf bhh bhl bla blb blc blf blh bll c-- caa cab cac caf cah cal cba cbb cbc cbf cbh cbl cca ccb ccc ccf cch ccl cfa cfb cfc cff cfh cfl ch- cha chb chc chf chh chl cl- cla clb clc clf clh cll faa fab fac faf fah fal fba fbb fbc fbf fbh fbl fca fcb fcc fcf fcl ffa ffc fff ffh ffl fha fhb fhc fhf fhh fhl fla flb flc flf fll haa hab hac haf hah hal hba hbb hbc hbf hbh hbl hca hcb hcc hcf hch hcl hfa hfb hfc hff hfh hfl hha hhb hhc hhf hhh hhl hla hlb hlc hlf hlh hll la- laa lab lac laf lah lal lba lbb lbc lbf lbh lbl lca lcb lcc lcf lch lcl lfa lfb lfc lff lfh lfl lha lhb lhc lhf lhh lla llb llc llf lll