iii iio iis iit io- ioi ioo ios iot is- isi iso iss ist isy iti ito its itt ity iyo iys iyt iyy o-i oii oio ois oit oo- ooi ooo oos oot os- osi oso oss ost ot- oti oto ots ott oyi oyo oys sii sio sis sit soi soo sos sot soy ss- ssi sso sss sst sti sto sts stt sty sy- syi sys syt tii tio tis tit tiy to- toi too tos tot toy tsi tso tss tst tsy tti tto tts ttt tty tyo tys tyt yii yio yis yit yoi yoo yos yot yoy ysi yso yss yst ysy yto yts ytt yys yyt yyy