-er ddd dde ddi ddk ddp ddr dds ddt de- ded dee dei dek dep der des det di- did die dii dik dip dir dis dit dke dki dkk dkp dkr dks dkt dpd dpe dpi dpk dpp dpr dps dpt drd dre dri drk drp drr drs drt dsd dse dsi dsk dsp dsr dss dst dtd dte dti dtk dtp dtr dts dtt ed- edd ede edi edk edp edr eds edt eed eee eek eep eer ees eet eid eie eii eik eip eir eis eit ekd eke eki ekp ekr eks ekt ep- epd epe epi epp epr eps ept erd ere eri erk erp err ers ert es- esd ese esi esk esp esr ess est etd ete eti etk etp etr ets ett i-d idd ide idi idk idp idr ids idt ie- ied iee iei iek iep ier ies iet iid iie iii iip iir iis iit ike iki ikk ikr iks ikt ipd ipe ipi ipp ipr ips ipt ir- ird ire iri irk irp irr irs irt is- isd ise isi isk isp isr iss ist itd ite iti itk itp its itt k-t kde kdk kdp kdr kds kdt ke- ked kee kei kek kep ker kes ket kid kie kii kik kip kir kis kit kke kki kkk kkp kkr kks kkt kpd kpe kpi kpk kpp kpr kps kpt krd kri krk krp krr krs krt ksd kse ksi ksk ksp ksr kss kst kte ktk ktp ktr kts ktt p-p pdd pde pdi pdk pdp pdr pds pdt ped pee pei pek pep per pes pet pid pie pii pik pip pir pis pit pkd pke pki pkp pkr pks pkt ppd ppe ppi ppk ppp ppr pps ppt prd pre pri prk prp prr prs prt ps- psd pse psi psk psp psr pss pst pt- ptd pte pti ptk ptp ptr pts ptt rdd rde rdi rdp rdr rds rdt re- red ree rei rek rep rer res ret rid rie rii rik rip rir ris rit rke rkk rkp rks rkt rpd rpe rpi rpk rpp rpr rps rpt rrd rri rrk rrp rrr rrs rrt rsd rse rsi rsk rsp rsr rss rst rtd rte rti rtk rtp rtr rts rtt sdd sde sdi sdk sdp sdr sds sdt se- sed see sei sek sep ser ses set sid sie sii sik sip sir sis sit sk- skd ske ski skk skp skr sks skt spd spe spi spk spp spr sps spt sr- srd sre sri srk srp srr srs srt ss- ssd sse ssi ssk ssp ssr sss sst std ste sti stk stp str sts stt tdd tde tdi tdk tdp tdr tds tdt te- ted tee tei tek tep ter tes tet tid tie tii tik tip tir tis tit tke tkk tkp tkr tks tkt tpd tpe tpi tpk tpp tpr tps tpt trd tre tri trk trp trr trs trt tsd tse tsi tsk tsp tsr tss tst ttd tte tti ttk ttp ttr tts ttt