ddd ddf ddi ddp dds dfd dff dfi dfp dfs di- did dif dii dip dis dpd dpf dpi dpp dps dsd dsf dsi dsp dss fdd fdf fdi fdp fds ffd fff ffi ffp ffs fid fif fii fip fis fpd fpi fpp fps fsd fsf fsi fsp fss i-d i-f idd idf idi idp ids ifd iff ifi ifp ifs iid iif iii iip iis ipd ipf ipi ipp ips is- isd isf isi isp iss p-p pdd pdf pdi pdp pds pfd pff pfi pfp pfs pid pif pii pip pis ppd ppf ppi ppp pps ps- psd psf psi psp pss sdd sdf sdi sdp sds sfd sff sfi sfp sfs sid sif sii sip sis spd spf spi spp sps ss- ssd ssf ssi ssp sss