-al a-a a-b a-c aaa aab aac aah aal aas ab- aba abb abc abh abl abs ac- aca acb acc ach acl acs aha ahb ahc ahh ahl ahs al- ala alb alc alh all als as- asa asb asc ash asl ass baa bab bac bah bal bas bba bbb bbc bbh bbl bbs bca bcb bcc bch bcl bcs bha bhb bhc bhh bhl bhs bla blb blc blh bll bls bsa bsb bsc bsh bsl bss c-- caa cab cac cah cal cas cba cbb cbc cbh cbl cbs cca ccb ccc cch ccl ccs ch- cha chb chc chh chl chs cl- cla clb clc clh cll cls csa csb csc csh csl css haa hab hac hah hal has hba hbb hbc hbh hbl hbs hca hcb hcc hch hcl hcs hha hhb hhc hhh hhl hhs hla hlb hlc hlh hll hls hsa hsb hsc hsh hsl hss la- laa lab lac lah lal las lba lbb lbc lbh lbl lbs lca lcb lcc lch lcl lcs lha lhb lhc lhh lhs lla llb llc lll lls lsa lsb lsc lsh lsl lss saa sab sac sah sal sas sba sbb sbc sbh sbl sbs sca scb scc sch scl scs sh- sha shb shc shh shl shs sla slb slc slh sll sls ss- ssa ssb ssc ssh ssl sss