-al a-a a-b a-c aaa aab aac aaf aah aak aal ab- aba abb abc abf abh abk abl ac- aca acb acc acf ach ack acl af- afa afb afc aff afh afk afl aha ahb ahc ahf ahh ahk ahl aka akb akc akh akk akl al- ala alb alc alf alh alk all baa bab bac baf bah bak bal bba bbb bbc bbf bbh bbk bbl bca bcb bcc bcf bch bck bcl bfa bfb bfc bff bfh bfl bha bhb bhc bhf bhh bhk bhl bka bkb bkc bkf bkk bkl bla blb blc blf blh blk bll c-- caa cab cac caf cah cak cal cba cbb cbc cbf cbh cbk cbl cca ccb ccc ccf cch cck ccl cfa cfb cfc cff cfh cfk cfl ch- cha chb chc chf chh chk chl cka ckb ckc ckh cl- cla clb clc clf clh clk cll faa fab fac faf fah fak fal fba fbb fbc fbf fbh fbk fbl fca fcb fcc fcf fck fcl ffa ffc fff ffh ffk ffl fha fhb fhc fhf fhh fhl fka fkb fkc fkf fkk fkl fla flb flc flf fll haa hab hac haf hah hak hal hba hbb hbc hbf hbh hbk hbl hca hcb hcc hcf hch hck hcl hfa hfb hfc hff hfh hfk hfl hha hhb hhc hhf hhh hhk hhl hka hkb hkf hkh hkk hkl hla hlb hlc hlf hlh hll ka- kaa kab kac kaf kah kak kal kba kbb kbc kbf kbh kbk kbl kca kcb kcc kch kck kcl kfa kfc kff kfh kha khf khh khk kkb kkc kkh kkk kkl kl- kla klb klc klf klh la- laa lab lac laf lah lak lal lba lbb lbc lbf lbh lbk lbl lca lcb lcc lcf lch lck lcl lfa lfb lfc lff lfh lfk lfl lha lhb lhc lhf lhh lhk lka lkb lkh lkl lla llb llc llf llk lll