a-a a-b aaa aab aad aak aam ab- aba abb abd abk abm ad- ada adb add adk adm aka akb akd akk akm ama amb amd amk amm baa bab bad bak bam bba bbb bbd bbk bbm bda bdb bdd bdk bdm bka bkb bkk bkm bma bmb bmd bmk bmm daa dab dad dak dam dba dbb dbd dbk dbm dda ddb ddd ddk ddm dka dkb dkk dkm dma dmb dmd dmk dmm ka- kaa kab kad kak kam kba kbb kbd kbk kbm kda kdb kdk kdm kkb kkk kkm kma kmb kmd kmk kmm maa mab mad mak mam mba mbb mbd mbk mbm mda mdb mdd mdk mdm mka mkb mkd mkk mkm mma mmb mmd mmk mmm