-er -up ddd dde ddf ddp ddr dds ddu de- ded dee def dep der des deu dfd dfe dff dfp dfr dfs dfu dpd dpe dpf dpp dpr dps dpu drd dre drp drr drs dru dsd dse dsf dsp dsr dss dsu dud due duf dup dur dus ed- edd ede edf edp edr eds edu eed eee eef eep eer ees ef- efd efe eff efp efr efs ep- epd epe epf epp epr eps epu erd ere erf erp err ers eru es- esd ese esf esp esr ess esu eu- eud eue euf eup eur eus fdd fde fdf fdp fdr fds fdu fed fee fef fep fer fes feu ffd ffe fff ffp ffr ffs ffu fpd fpe fpp fpr fps fpu frd fre frf frp frr frs fru fsd fse fsf fsp fsr fss fsu fud fue fuf fup fur fus fuu p-p pdd pde pdf pdp pdr pds pdu ped pee pef pep per pes peu pfd pfe pff pfp pfr pfs pfu ppd ppe ppf ppp ppr pps ppu prd pre prf prp prr prs pru ps- psd pse psf psp psr pss psu pud pue puf pup pur pus puu rdd rde rdf rdp rdr rds rdu re- red ree ref rep rer res reu rfd rfe rff rfp rfr rfs rfu rpd rpe rpf rpp rpr rps rpu rrd rrf rrp rrr rrs rru rsd rse rsf rsp rsr rss rsu rud rue ruf rup rur rus ruu sdd sde sdf sdp sdr sds sdu se- sed see sef sep ser ses seu sfd sfe sff sfp sfr sfs sfu spd spe spf spp spr sps spu sr- srd sre srf srp srr srs ss- ssd sse ssf ssp ssr sss ssu sud sue suf sup sur sus suu udd ude udf udp udr uds udu ued uee uef uep uer ues ufd ufe uff ufp ufr ufs ufu up- upd upe upf upp upr ups upu ur- urd ure urf urp urr urs uru usd use usf usp usr uss usu uue uur uus uuu