a-a a-b a-i aaa aab aaf aai aam aao aay ab- aba abb abf abi abm abo aby af- afa afb aff afi afm afo afy ai- aia aib aif aii aim aio aiy ama amb amf ami amm amo amy aoa aob aof aoi aom aoo ay- aya ayf ayi ayo baa bab baf bai bam bao bay bba bbb bbf bbi bbm bbo bby bfa bfb bff bfi bfm bfo bfy bi- bia bib bif bii bim bio biy bma bmb bmf bmi bmm bmo boa bob bof boi bom boo boy by- bya byf byi bym byo faa fab faf fai fam fao fay fba fbb fbf fbi fbm fbo ffa fff ffi ffm ffo ffy fia fib fif fii fim fma fmb fmf fmi fmm fmo foa fob fof foi fom foo foy fy- fya fyb fyi fyo i-f ia- iaa iab iaf iai iam iao iba ibb ibf ibi ibm ibo iby ifa ifb iff ifi ifm ifo ify iia iib iif iii iim iio im- ima imb imf imi imm imo imy io- ioa iob iof ioi iom ioo iya iym iyo iyy m-f m-o maa mab maf mai mam mao may mba mbb mbf mbi mbm mbo mfa mfb mff mfi mfm mfo mfy mi- mia mib mif mii mim mio miy mma mmb mmf mmi mmm mmo moa mob mof moi mom moo moy my- mya myb myf mym myo o-i oaa oab oaf oai oam oao ob- oba obb obf obi obm obo oby of- ofa ofb off ofi ofm ofo oia oib oif oii oim oio om- oma omb omf omi omm omo omy oo- ooa oob oof ooi oom ooo oya oyi oyo yaa yab yaf yai yam yao yay ybf ybi ybm yby yfa yff yfm yif yii yim yio yma ymi ymm ymo yob yof yoi yom yoo yoy yyb yyf yyy