-er ddd dde ddi ddk ddn ddo ddp ddr dds de- ded dee dei dek den deo dep der des di- did die dii dik din dio dip dir dis dke dki dkk dko dkp dkr dks dnd dne dni dnk dnn dno dnp dnr dns dod doe doi dok don doo dop dor dos dpd dpe dpi dpk dpn dpo dpp dpr dps drd dre dri drk drn dro drp drr drs dsd dse dsi dsk dsn dso dsp dsr dss ed- edd ede edi edk edn edo edp edr eds eed eee eek een eeo eep eer ees eid eie eii eik ein eio eip eir eis ekd eke eki eko ekp ekr eks en- end ene eni enk enn eno enp enr ens eo- eod eoe eoi eok eon eoo eop eor eos ep- epd epe epi epn epo epp epr eps erd ere eri erk ern ero erp err ers es- esd ese esi esk esn eso esp esr ess i-d idd ide idi idk idn ido idp idr ids ie- ied iee iei iek ien iep ier ies iid iie iii iin iio iip iir iis ike iki ikk iko ikr iks in- ind ine ini ink inn ino inp inr ins io- iod ioe ioi ion ioo iop ior ios ipd ipe ipi ipn ipo ipp ipr ips ir- ird ire iri irk irn iro irp irr irs is- isd ise isi isk isn iso isp isr iss kde kdk kdo kdp kdr kds ke- ked kee kei kek ken keo kep ker kes kid kie kii kik kin kio kip kir kis kke kki kkk kkn kkp kkr kks kn- knd kne kni knk knn kno knp knr kod koe koi kok kon koo kop kor kos kpd kpe kpi kpk kpn kpo kpp kpr kps krd kri krk krn kro krp krr krs ksd kse ksi ksk ksn kso ksp ksr kss n-i ndd nde ndi ndk ndn ndo ndp ndr nds ne- ned nee nei nek nen neo nep ner nes nid nie nii nik nin nio nip nir nis nke nki nkk nkn nko nkp nkr nks nne nni nnk nnn nno nnp nns no- nod noe noi nok non noo nop nor nos npd npe npi npn npo npp npr nps nrd nre nri nrk nrn nro nrp nrr nrs nsd nse nsi nsk nsn nso nsp nsr nss o-i odd ode odi odn odo odp odr ods oed oee oei oen oeo oep oer oes oid oie oii oik oin oio oip oir ois okd oke oki okk oko okp okr oks on- ond one oni onk onn ono onp onr ons oo- ood ooi ook oon ooo oop oor oos op- opd ope opi opk opn opo opp opr ops or- ord ore ori ork orn oro orp orr ors os- osd ose osi osk osn oso osp osr oss p-p pdd pde pdi pdk pdn pdo pdp pdr pds ped pee pei pek pen peo pep per pes pid pie pii pik pin pio pip pir pis pkd pke pki pkn pko pkp pkr pks pn- pnd pne pni pnk pnn pno pnp pnr pns pod poe poi pok pon poo pop por pos ppd ppe ppi ppk ppn ppo ppp ppr pps prd pre pri prk prn pro prp prr prs ps- psd pse psi psk psn pso psp psr pss rdd rde rdi rdn rdo rdp rdr rds re- red ree rei rek ren reo rep rer res rid rie rii rik rin rio rip rir ris rke rkk rko rkp rks rnd rni rnn rno rnp rnr rns rod roe roi rok ron roo rop ror ros rpd rpe rpi rpk rpn rpo rpp rpr rps rrd rri rrk rrn rrp rrr rrs rsd rse rsi rsk rsn rso rsp rsr rss sdd sde sdi sdk sdn sdo sdp sdr sds se- sed see sei sek sen seo sep ser ses sid sie sii sik sin sio sip sir sis sk- skd ske ski skk sko skp skr sks snd sne sni snk snn sno snp snr sns sod soe soi sok son soo sop sor sos spd spe spi spk spn spo spp spr sps sr- srd sre sri srk srn sro srp srr srs ss- ssd sse ssi ssk ssn sso ssp ssr sss