a-a a-b a-i aaa aab aai aak aam aas ab- aba abb abi abk abm abs ai- aia aib aii aik aim ais aka akb aki akk akm aks ama amb ami amk amm ams as- asa asb asi ask asm ass baa bab bai bak bam bas bba bbb bbi bbk bbm bbs bi- bia bib bii bik bim bis bka bkb bkk bkm bks bma bmb bmi bmk bmm bms bsa bsb bsi bsk bsm bss ia- iaa iab iai iam ias iba ibb ibi ibk ibm ibs iia iib iii iim iis ika ikb iki ikk iks im- ima imb imi imm ims is- isa isb isi isk ism iss ka- kaa kab kai kak kam kas kba kbb kbi kbk kbm kbs kia kib kii kik kim kis kkb kki kkk kkm kks kma kmb kmi kmk kmm kms ksa ksb ksi ksk ksm kss maa mab mai mak mam mas mba mbb mbi mbk mbm mbs mi- mia mib mii mik mim mis mka mkb mkk mkm mks mma mmb mmi mmk mmm mms msa msb msi msk msm mss saa sab sai sak sam sas sba sbb sbi sbk sbm sbs sia sib sii sik sim sis sk- ska skb ski skk skm sks sma smb smi smk smm sms ss- ssa ssb ssi ssk ssm sss