a-a a-b a-i aaa aab aag aai aam aas ab- aba abb abg abi abm abs ag- aga agb agg agi agm ags ai- aia aib aig aii aim ais ama amb amg ami amm ams as- asa asb asg asi asm ass baa bab bag bai bam bas bba bbb bbg bbi bbm bbs bga bgb bgg bgi bgm bgs bi- bia bib big bii bim bis bma bmb bmg bmi bmm bms bsa bsb bsg bsi bsm bss gaa gab gag gai gam gas gba gbg gbi gbm gbs gga ggb ggg ggi ggm ggs gia gib gig gii gim gis gma gmb gmg gmi gmm gms gsa gsb gsg gsi gsm gss ia- iaa iab iag iai iam ias iba ibb ibg ibi ibm ibs iga igb igg igi igm igs iia iib iii iim iis im- ima imb img imi imm ims is- isa isb isg isi ism iss maa mab mag mai mam mas mba mbb mbg mbi mbm mbs mga mgb mgi mgm mgs mi- mia mib mig mii mim mis mma mmb mmg mmi mmm mms msa msb msg msi msm mss saa sab sag sai sam sas sba sbb sbg sbi sbm sbs sga sgb sgg sgi sgm sgs sia sib sig sii sim sis sma smb smg smi smm sms ss- ssa ssb ssg ssi ssm sss