bbb bbi bbn bbo bbs bbt bby bi- bib bii bin bio bis bit biy bnb bni bnn bno bns bnt bob boi bon boo bos bot boy bsb bsi bsn bso bss bst bsy btb bti btn bto bts btt bty by- byi byn byo bys byt ibb ibi ibn ibo ibs ibt iby iib iii iin iio iis iit in- inb ini inn ino ins int iny io- iob ioi ion ioo ios iot is- isb isi isn iso iss ist isy itb iti itn ito its itt ity iyo iys iyt iyy n-i nbb nbi nbn nbo nbs nbt nib nii nin nio nis nit nnb nni nnn nno nns nnt no- nob noi non noo nos not noy nsb nsi nsn nso nss nst nsy ntb nti ntn nto nts ntt nyn nyo nys nyt nyy o-i ob- obb obi obn obo obs obt oby oib oii oin oio ois oit on- onb oni onn ono ons ont ony oo- oob ooi oon ooo oos oot os- osb osi osn oso oss ost ot- otb oti otn oto ots ott oyi oyo oys sbb sbi sbn sbo sbs sbt sby sib sii sin sio sis sit snb sni snn sno sns snt sny sob soi son soo sos sot soy ss- ssb ssi ssn sso sss sst stb sti stn sto sts stt sty sy- syb syi syn sys syt tbb tbi tbn tbo tbs tbt tib tii tin tio tis tit tiy tnb tni tnn tno tns tnt to- tob toi ton too tos tot toy tsb tsi tsn tso tss tst tsy ttb tti ttn tto tts ttt tty tyn tyo tys tyt ybi ybs yby yii yin yio yis yit ynn yns yny yob yoi yon yoo yos yot yoy ysb ysi yso yss yst ysy ytn yto yts ytt yyb yys yyt yyy