-er -up ddd dde ddi ddp ddr dds ddu de- ded dee dei dep der des deu di- did die dii dip dir dis diu dpd dpe dpi dpp dpr dps dpu drd dre dri drp drr drs dru dsd dse dsi dsp dsr dss dsu dud due dui dup dur dus ed- edd ede edi edp edr eds edu eed eee eep eer ees eid eie eii eip eir eis eiu ep- epd epe epi epp epr eps epu erd ere eri erp err ers eru es- esd ese esi esp esr ess esu eu- eud eue eui eup eur eus i-d idd ide idi idp idr ids idu ie- ied iee iei iep ier ies iid iie iii iip iir iis iiu ipd ipe ipi ipp ipr ips ipu ir- ird ire iri irp irr irs iru is- isd ise isi isp isr iss isu iu- iud iue iui iup iur ius p-p pdd pde pdi pdp pdr pds pdu ped pee pei pep per pes peu pid pie pii pip pir pis piu ppd ppe ppi ppp ppr pps ppu prd pre pri prp prr prs pru ps- psd pse psi psp psr pss psu pud pue pui pup pur pus puu rdd rde rdi rdp rdr rds rdu re- red ree rei rep rer res reu rid rie rii rip rir ris rpd rpe rpi rpp rpr rps rpu rrd rri rrp rrr rrs rru rsd rse rsi rsp rsr rss rsu rud rue rui rup rur rus ruu sdd sde sdi sdp sdr sds sdu se- sed see sei sep ser ses seu sid sie sii sip sir sis siu spd spe spi spp spr sps spu sr- srd sre sri srp srr srs ss- ssd sse ssi ssp ssr sss ssu sud sue sui sup sur sus suu udd ude udi udp udr uds udu ued uee uei uep uer ues uid uie uii uip uir uis uiu up- upd upe upi upp upr ups upu ur- urd ure uri urp urr urs uru usd use usi usp usr uss usu uue uur uus uuu