-al a-a a-b a-c aaa aab aac aal aam ab- aba abb abc abl abm ac- aca acb acc acl acm al- ala alb alc all alm ama amb amc aml amm baa bab bac bal bam bba bbb bbc bbl bbm bca bcb bcc bcl bcm bla blb blc bll blm bma bmb bmc bml bmm c-- caa cab cac cal cam cba cbb cbc cbl cbm cca ccb ccc ccl ccm cl- cla clb clc cll clm cma cmb cmc cml cmm la- laa lab lac lal lam lba lbb lbc lbl lbm lca lcb lcc lcl lcm lla llb llc lll llm lma lmb lmc lml lmm maa mab mac mal mam mba mbb mbc mbl mbm mc- mca mcb mcc mcl mcm mla mlb mlc mll mlm mma mmb mmc mml mmm