iii iip iis iix iki ikk iks ikx ipi ipp ips ipx ipy is- isi isk isp iss isy ixi ixy iys iyy kii kik kip kis kix kki kkk kkp kks kky kpi kpk kpp kps ksi ksk ksp kss kxy kyp kys kyx p-p pii pik pip pis pix pki pkp pks pky ppi ppk ppp pps ppx ps- psi psk psp pss psx psy pxk pxs py- pyk pys pyx sii sik sip sis six sk- ski skk skp sks skx sky spi spk spp sps spx spy ss- ssi ssk ssp sss ssx sxi sxs sy- syi syk syp sys syx xii xis xix xks xpp xps xsi xsp xss xxi xxp xxx xxy xyp xyy yii yip yis yki ykk yps ysi ysk ysp yss ysy yxy yys yyy