ddd ddi ddp dds ddt ddy di- did dii dip dis dit diy dpd dpi dpp dps dpt dsd dsi dsp dss dst dsy dtd dti dtp dts dtt dty dy- dyd dyp dys dyy i-d idd idi idp ids idt idy iid iii iip iis iit ipd ipi ipp ips ipt ipy is- isd isi isp iss ist isy itd iti itp its itt ity iys iyt iyy p-p pdd pdi pdp pds pdt pid pii pip pis pit ppd ppi ppp pps ppt ps- psd psi psp pss pst psy pt- ptd pti ptp pts ptt pty py- pyd pys pyt sdd sdi sdp sds sdt sdy sid sii sip sis sit spd spi spp sps spt spy ss- ssd ssi ssp sss sst std sti stp sts stt sty sy- syd syi syp sys syt tdd tdi tdp tds tdt tdy tid tii tip tis tit tiy tpd tpi tpp tps tpt tsd tsi tsp tss tst tsy ttd tti ttp tts ttt tty tyd typ tys tyt yds ydt ydy yid yii yip yis yit ypd yps ysi ysp yss yst ysy ytd ytp yts ytt yys yyt yyy