ddd dde ddn ddp dds ddx de- ded dee den dep des dex dnd dne dnn dnp dns dpd dpe dpn dpp dps dsd dse dsn dsp dss dsx dxd dxn dxp dxs dxx ed- edd ede edn edp eds edx eed eee een eep ees eex en- end ene enn enp ens ep- epd epe epn epp eps epx es- esd ese esn esp ess esx ex- exd exe exp exs exx ndd nde ndn ndp nds ne- ned nee nen nep nes nex nne nnn nnp nns npd npe npn npp nps nsd nse nsn nsp nss nsx nxd p-p pdd pde pdn pdp pds pdx ped pee pen pep pes pex pn- pnd pne pnn pnp pns pnx ppd ppe ppn ppp pps ppx ps- psd pse psn psp pss psx pxe pxs sdd sde sdn sdp sds se- sed see sen sep ses sex snd sne snn snp sns spd spe spn spp sps spx ss- ssd sse ssn ssp sss ssx sxn sxs xde xds xed xee xen xep xes xex xns xpd xpe xpn xpp xps xsp xss xxp xxx