ddd ddi ddo ddp dds ddx ddy di- did dii dio dip dis dix diy dod doi doo dop dos dox doy dpd dpi dpo dpp dps dsd dsi dso dsp dss dsx dsy dxd dxi dxo dxp dxs dxx dy- dyd dyo dyp dys dyy i-d idd idi ido idp ids idx idy iid iii iio iip iis iix io- iod ioi ioo iop ios ipd ipi ipo ipp ips ipx ipy is- isd isi iso isp iss isy ixi ixy iyo iys iyy o-i odd odi odo odp ods oid oii oio oip ois oo- ood ooi ooo oop oos oox op- opd opi opo opp ops opx opy os- osd osi oso osp oss osx ox- oxi oxo oxx oxy oyd oyi oyo oys p-p pdd pdi pdo pdp pds pdx pid pii pio pip pis pix pod poi poo pop pos pox poy ppd ppi ppo ppp pps ppx ps- psd psi pso psp pss psx psy pxs py- pyd pyo pys pyx sdd sdi sdo sdp sds sdy sid sii sio sip sis six sod soi soo sop sos sox soy spd spi spo spp sps spx spy ss- ssd ssi sso ssp sss ssx sxi sxs sy- syd syi syp sys syx xdi xds xii xio xis xix xod xoi xoo xop xos xox xpd xpo xpp xps xsi xsp xss xxi xxo xxp xxx xxy xyp xyy ydo yds ydy yid yii yio yip yis yod yoi yoo yop yos yox yoy ypd ypo yps ysi yso ysp yss ysy yxy yys yyy