-al a-a a-b a-c aaa aab aac aae aah aal ab- aba abb abc abe abh abl ac- aca acb acc ace ach acl aea aeb aec aee aeh ael aha ahb ahc ahe ahh ahl al- ala alb alc ale alh all baa bab bac bae bah bal bba bbb bbc bbe bbh bbl bca bcb bcc bce bch bcl be- bea beb bec bee beh bel bha bhb bhc bhe bhh bhl bla blb blc ble blh bll c-- caa cab cac cae cah cal cba cbb cbc cbe cbh cbl cca ccb ccc cce cch ccl ce- cea ceb cec cee ceh cel ch- cha chb chc che chh chl cl- cla clb clc cle clh cll eaa eab eac eae eah eal eba ebb ebc ebe ebh ebl ec- eca ecb ecc ece ech ecl eea eeb eec eee eel eha ehb ehc ehe ehh ehl ela elb elc ele elh ell haa hab hac hae hah hal hba hbb hbc hbe hbh hbl hca hcb hcc hce hch hcl he- hea heb hec hee heh hel hha hhb hhc hhe hhh hhl hla hlb hlc hle hlh hll la- laa lab lac lae lah lal lba lbb lbc lbe lbh lbl lca lcb lcc lce lch lcl lea leb lec lee leh lel lha lhb lhc lhh lla llb llc lle lll