-er ddd dde ddi ddk ddo ddr dds ddt de- ded dee dei dek deo der des det di- did die dii dik dio dir dis dit dke dki dkk dko dkr dks dkt dod doe doi dok doo dor dos dot drd dre dri drk dro drr drs drt dsd dse dsi dsk dso dsr dss dst dtd dte dti dtk dto dtr dts dtt ed- edd ede edi edk edo edr eds edt eed eee eek eeo eer ees eet eid eie eii eik eio eir eis eit ekd eke eki eko ekr eks ekt eo- eod eoe eoi eok eoo eor eos eot erd ere eri erk ero err ers ert es- esd ese esi esk eso esr ess est etd ete eti etk eto etr ets ett i-d idd ide idi idk ido idr ids idt ie- ied iee iei iek ier ies iet iid iie iii iio iir iis iit ike iki ikk iko ikr iks ikt io- iod ioe ioi ioo ior ios iot ir- ird ire iri irk iro irr irs irt is- isd ise isi isk iso isr iss ist itd ite iti itk ito its itt k-t kde kdk kdo kdr kds kdt ke- ked kee kei kek keo ker kes ket kid kie kii kik kio kir kis kit kke kki kkk kkr kks kkt kod koe koi kok koo kor kos kot krd kri krk kro krr krs krt ksd kse ksi ksk kso ksr kss kst kte ktk kto ktr kts ktt o-i odd ode odi odo odr ods odt oed oee oei oeo oer oes oet oid oie oii oik oio oir ois oit okd oke oki okk oko okr oks oo- ood ooi ook ooo oor oos oot or- ord ore ori ork oro orr ors ort os- osd ose osi osk oso osr oss ost ot- otd ote oti otk oto otr ots ott rdd rde rdi rdo rdr rds rdt re- red ree rei rek reo rer res ret rid rie rii rik rio rir ris rit rke rkk rko rks rkt rod roe roi rok roo ror ros rot rrd rri rrk rrr rrs rrt rsd rse rsi rsk rso rsr rss rst rtd rte rti rtk rto rtr rts rtt sdd sde sdi sdk sdo sdr sds sdt se- sed see sei sek seo ser ses set sid sie sii sik sio sir sis sit sk- skd ske ski skk sko skr sks skt sod soe soi sok soo sor sos sot sr- srd sre sri srk sro srr srs srt ss- ssd sse ssi ssk sso ssr sss sst std ste sti stk sto str sts stt tdd tde tdi tdk tdo tdr tds tdt te- ted tee tei tek teo ter tes tet tid tie tii tik tio tir tis tit tke tkk tko tkr tks tkt to- tod toe toi tok too tor tos tot trd tre tri trk tro trr trs trt tsd tse tsi tsk tso tsr tss tst ttd tte tti ttk tto ttr tts ttt