-er -up ddd dde ddp ddr dds ddu ddx de- ded dee dep der des deu dex dpd dpe dpp dpr dps dpu drd dre drp drr drs dru drx dsd dse dsp dsr dss dsu dsx dud due dup dur dus dux dxd dxp dxr dxs dxx ed- edd ede edp edr eds edu edx eed eee eep eer ees eex ep- epd epe epp epr eps epu epx erd ere erp err ers eru es- esd ese esp esr ess esu esx eu- eud eue eup eur eus eux ex- exd exe exp exr exs exu exx p-p pdd pde pdp pdr pds pdu pdx ped pee pep per pes peu pex ppd ppe ppp ppr pps ppu ppx prd pre prp prr prs pru prx ps- psd pse psp psr pss psu psx pud pue pup pur pus puu pxe pxr pxs rdd rde rdp rdr rds rdu rdx re- red ree rep rer res reu rex rpd rpe rpp rpr rps rpu rpx rrd rrp rrr rrs rru rsd rse rsp rsr rss rsu rsx rud rue rup rur rus ruu rux rxp rxr rxs sdd sde sdp sdr sds sdu se- sed see sep ser ses seu sex spd spe spp spr sps spu spx sr- srd sre srp srr srs srx ss- ssd sse ssp ssr sss ssu ssx sud sue sup sur sus suu sux sxs sxu udd ude udp udr uds udu udx ued uee uep uer ues up- upd upe upp upr ups upu upx ur- urd ure urp urr urs uru urx usd use usp usr uss usu usx uue uur uus uuu uxr uxu xde xdr xds xed xee xep xer xes xeu xex xpd xpe xpp xps xrd xrx xsp xss xue xup xus xxp xxx