ddd dde ddf ddp dds de- ded dee def dep des dfd dfe dff dfp dfs dpd dpe dpf dpp dps dsd dse dsf dsp dss ed- edd ede edf edp eds eed eee eef eep ees ef- efd efe eff efp efs ep- epd epe epf epp eps es- esd ese esf esp ess fdd fde fdf fdp fds fed fee fef fep fes ffd ffe fff ffp ffs fpd fpe fpp fps fsd fse fsf fsp fss p-p pdd pde pdf pdp pds ped pee pef pep pes pfd pfe pff pfp pfs ppd ppe ppf ppp pps ps- psd pse psf psp pss sdd sde sdf sdp sds se- sed see sef sep ses sfd sfe sff sfp sfs spd spe spf spp sps ss- ssd sse ssf ssp sss