-er ddd dde ddf ddk ddn ddo ddr dds ddt de- ded dee def dek den deo der des det dfd dfe dff dfk dfn dfo dfr dfs dft dke dkk dko dkr dks dkt dnd dne dnf dnk dnn dno dnr dns dnt dod doe dof dok don doo dor dos dot drd dre drk drn dro drr drs drt dsd dse dsf dsk dsn dso dsr dss dst dtd dte dtf dtk dtn dto dtr dts dtt ed- edd ede edf edk edn edo edr eds edt eed eee eef eek een eeo eer ees eet ef- efd efe eff efo efr efs eft ekd eke ekf eko ekr eks ekt en- end ene enf enk enn eno enr ens ent eo- eod eoe eof eok eon eoo eor eos eot erd ere erf erk ern ero err ers ert es- esd ese esf esk esn eso esr ess est etd ete etf etk etn eto etr ets ett fdd fde fdf fdk fdn fdo fdr fds fdt fed fee fef fek fen feo fer fes fet ffd ffe fff ffk ffn ffo ffr ffs fft fkf fkk fkt fnd fne fnf fnk fnn fnr fns fnt foe fof fok fon foo for fos fot frd fre frf frk frn fro frr frs frt fsd fse fsf fsk fsn fso fsr fss fst ftd fte ftf ftk ftn fto ftr fts ftt k-t kde kdf kdk kdo kdr kds kdt ke- ked kee kef kek ken keo ker kes ket kfd kff kfo kfs kke kkk kkn kkr kks kkt kn- knd kne knf knk knn kno knr knt kod koe kof kok kon koo kor kos kot krd krf krk krn kro krr krs krt ksd kse ksf ksk ksn kso ksr kss kst kte ktf ktk ktn kto ktr kts ktt ndd nde ndf ndk ndn ndo ndr nds ndt ne- ned nee nef nek nen neo ner nes net nfd nfe nff nfk nfn nfo nfr nfs nft nke nkf nkk nkn nko nkr nks nkt nne nnf nnk nnn nno nns nnt no- nod noe nof nok non noo nor nos not nrd nre nrf nrk nrn nro nrr nrs nrt nsd nse nsf nsk nsn nso nsr nss nst ntd nte ntf ntk ntn nto ntr nts ntt odd ode odf odn odo odr ods odt oed oee oef oen oeo oer oes oet of- ofd ofe off ofn ofo ofr ofs oft okd oke okk oko okr oks on- ond one onf onk onn ono onr ons ont oo- ood oof ook oon ooo oor oos oot or- ord ore orf ork orn oro orr ors ort os- osd ose osf osk osn oso osr oss ost ot- otd ote otf otk otn oto otr ots ott rdd rde rdf rdn rdo rdr rds rdt re- red ree ref rek ren reo rer res ret rfd rfe rff rfk rfn rfo rfr rfs rft rke rkf rkk rko rks rkt rnd rnn rno rnr rns rnt rod roe rof rok ron roo ror ros rot rrd rrf rrk rrn rrr rrs rrt rsd rse rsf rsk rsn rso rsr rss rst rtd rte rtf rtk rtn rto rtr rts rtt sdd sde sdf sdk sdn sdo sdr sds sdt se- sed see sef sek sen seo ser ses set sfd sfe sff sfk sfn sfo sfr sfs sft sk- skd ske skf skk sko skr sks skt snd sne snf snk snn sno snr sns snt sod soe sof sok son soo sor sos sot sr- srd sre srf srk srn sro srr srs srt ss- ssd sse ssf ssk ssn sso ssr sss sst std ste stf stk stn sto str sts stt tdd tde tdf tdk tdn tdo tdr tds tdt te- ted tee tef tek ten teo ter tes tet tfd tfe tff tfk tfn tfo tfr tfs tft tke tkk tko tkr tks tkt tnd tne tnf tnk tnn tno tnr tns tnt to- tod toe tof tok ton too tor tos tot trd tre trf trk trn tro trr trs trt tsd tse tsf tsk tsn tso tsr tss tst ttd tte ttf ttk ttn tto ttr tts ttt