a-a a-b a-t aaa aab aan aao aas aat aay ab- aba abb abn abo abs abt aby an- ana anb ann ano ans ant any aoa aob aon aoo aos aot as- asa asb asn aso ass ast asy at- ata atb atn ato ats att ay- aya ayn ayo ays ayt baa bab ban bao bas bat bay bba bbb bbn bbo bbs bbt bby bna bnb bnn bno bns bnt boa bob bon boo bos bot boy bsa bsb bsn bso bss bst bsy bta btb btn bto bts btt bty by- bya byn byo bys byt naa nab nan nao nas nat nay nba nbb nbn nbo nbs nbt nna nnb nnn nno nns nnt no- noa nob non noo nos not noy nsa nsb nsn nso nss nst nsy nta ntb ntn nto nts ntt nya nyn nyo nys nyt nyy oaa oab oan oao oas oat ob- oba obb obn obo obs obt oby on- ona onb onn ono ons ont ony oo- ooa oob oon ooo oos oot os- osa osb osn oso oss ost ot- ota otb otn oto ots ott oya oyo oys saa sab san sao sas sat say sba sbb sbn sbo sbs sbt sby sna snb snn sno sns snt sny soa sob son soo sos sot soy ss- ssa ssb ssn sso sss sst sta stb stn sto sts stt sty sy- sya syb syn sys syt taa tab tan tao tas tat tay tba tbb tbn tbo tbs tbt tna tnb tnn tno tns tnt to- toa tob ton too tos tot toy tsa tsb tsn tso tss tst tsy tta ttb ttn tto tts ttt tty tya tyn tyo tys tyt yaa yab yan yao yas yat yay ybs yby yna ynn yns yny yob yon yoo yos yot yoy ysa ysb yso yss yst ysy yta ytn yto yts ytt yyb yys yyt yyy