a-a a-b a-i aaa aab aae aai aak aam aas ab- aba abb abe abi abk abm abs aea aeb aee aei aek aem aes ai- aia aib aie aii aik aim ais aka akb ake aki akk akm aks ama amb ame ami amk amm ams as- asa asb ase asi ask asm ass baa bab bae bai bak bam bas bba bbb bbe bbi bbk bbm bbs be- bea beb bee bei bek bem bes bi- bia bib bie bii bik bim bis bka bkb bke bkk bkm bks bma bmb bme bmi bmk bmm bms bsa bsb bse bsi bsk bsm bss eaa eab eae eai eak eam eas eba ebb ebe ebi ebk ebm ebs eea eeb eee eek eem ees eia eib eie eii eik eim eis eka ekb eke eki eks em- ema emb eme emi emk emm ems es- esa esb ese esi esk esm ess ia- iaa iab iae iai iam ias iba ibb ibe ibi ibk ibm ibs ie- iea iee iei iek iem ies iia iib iie iii iim iis ika ikb ike iki ikk iks im- ima imb ime imi imm ims is- isa isb ise isi isk ism iss ka- kaa kab kae kai kak kam kas kba kbb kbe kbi kbk kbm kbs ke- kea keb kee kei kek kem kes kia kib kie kii kik kim kis kkb kke kki kkk kkm kks kma kmb kme kmi kmk kmm kms ksa ksb kse ksi ksk ksm kss maa mab mae mai mak mam mas mba mbb mbe mbi mbk mbm mbs mea meb mee mei mek mem mes mi- mia mib mie mii mik mim mis mka mkb mke mkk mkm mks mma mmb mme mmi mmk mmm mms msa msb mse msi msk msm mss saa sab sae sai sak sam sas sba sbb sbe sbi sbk sbm sbs se- sea seb see sei sek sem ses sia sib sie sii sik sim sis sk- ska skb ske ski skk skm sks sma smb sme smi smk smm sms ss- ssa ssb sse ssi ssk ssm sss