iii iio iip iis io- ioi ioo iop ios ipi ipo ipp ips ipy is- isi iso isp iss isy iyo iys iyy o-i oii oio oip ois oo- ooi ooo oop oos op- opi opo opp ops opy os- osi oso osp oss oyi oyo oys p-p pii pio pip pis poi poo pop pos poy ppi ppo ppp pps ps- psi pso psp pss psy py- pyo pys sii sio sip sis soi soo sop sos soy spi spo spp sps spy ss- ssi sso ssp sss sy- syi syp sys yii yio yip yis yoi yoo yop yos yoy ypo yps ysi yso ysp yss ysy yys yyy