-al a-a a-b a-c aaa aab aac aad aah aal ab- aba abb abc abd abh abl ac- aca acb acc acd ach acl ad- ada adb adc add adh adl aha ahb ahc ahd ahh ahl al- ala alb alc ald alh all baa bab bac bad bah bal bba bbb bbc bbd bbh bbl bca bcb bcc bcd bch bcl bda bdb bdc bdd bdh bdl bha bhb bhc bhd bhh bhl bla blb blc bld blh bll c-- caa cab cac cad cah cal cba cbb cbc cbd cbh cbl cca ccb ccc ccd cch ccl cda cdb cdc cdd cdh cdl ch- cha chb chc chd chh chl cl- cla clb clc cld clh cll daa dab dac dad dah dal dba dbb dbc dbd dbh dbl dca dcb dcc dcd dcl dda ddb ddc ddd ddh ddl dh- dha dhb dhc dhd dhh dhl dl- dla dlb dlc dld dlh dll haa hab hac had hah hal hba hbb hbc hbd hbh hbl hca hcb hcc hcd hch hcl hda hdb hdc hdd hdh hdl hha hhb hhc hhd hhh hhl hla hlb hlc hld hlh hll la- laa lab lac lad lah lal lba lbb lbc lbd lbh lbl lca lcb lcc lcd lch lcl lda ldb ldc ldd ldh ldl lha lhb lhc lhd lhh lla llb llc lld lll