ddd ddi ddp dds ddy di- did dii dip dis diy dpd dpi dpp dps dsd dsi dsp dss dsy dy- dyd dyp dys dyy i-d idd idi idp ids idy iid iii iip iis ipd ipi ipp ips ipy is- isd isi isp iss isy iys iyy p-p pdd pdi pdp pds pid pii pip pis ppd ppi ppp pps ps- psd psi psp pss psy py- pyd pys sdd sdi sdp sds sdy sid sii sip sis spd spi spp sps spy ss- ssd ssi ssp sss sy- syd syi syp sys yds ydy yid yii yip yis ypd yps ysi ysp yss ysy yys yyy