a-a a-b a-i aaa aab aai aam aao aas aay ab- aba abb abi abm abo abs aby ai- aia aib aii aim aio ais aiy ama amb ami amm amo ams amy aoa aob aoi aom aoo aos as- asa asb asi asm aso ass asy ay- aya ayi ayo ays baa bab bai bam bao bas bay bba bbb bbi bbm bbo bbs bby bi- bia bib bii bim bio bis biy bma bmb bmi bmm bmo bms boa bob boi bom boo bos boy bsa bsb bsi bsm bso bss bsy by- bya byi bym byo bys ia- iaa iab iai iam iao ias iba ibb ibi ibm ibo ibs iby iia iib iii iim iio iis im- ima imb imi imm imo ims imy io- ioa iob ioi iom ioo ios is- isa isb isi ism iso iss isy iya iym iyo iys iyy m-o maa mab mai mam mao mas may mba mbb mbi mbm mbo mbs mi- mia mib mii mim mio mis miy mma mmb mmi mmm mmo mms moa mob moi mom moo mos moy msa msb msi msm mso mss msy my- mya myb mym myo mys o-i oaa oab oai oam oao oas ob- oba obb obi obm obo obs oby oia oib oii oim oio ois om- oma omb omi omm omo oms omy oo- ooa oob ooi oom ooo oos os- osa osb osi osm oso oss oya oyi oyo oys saa sab sai sam sao sas say sba sbb sbi sbm sbo sbs sby sia sib sii sim sio sis sma smb smi smm smo sms smy soa sob soi som soo sos soy ss- ssa ssb ssi ssm sso sss sy- sya syb syi sym sys yaa yab yai yam yao yas yay ybi ybm ybs yby yii yim yio yis yma ymi ymm ymo yms yob yoi yom yoo yos yoy ysa ysb ysi ysm yso yss ysy yyb yys yyy