-er -ic c-- ccc cce ccf cci cck ccn cco ccr ccs ce- cec cee cef cei cek cen ceo cer ces cfc cfe cff cfi cfk cfn cfo cfr cfs ci- cic cie cif cii cik cin cio cir cis ckc cki cko cks cn- cnc cne cnf cni cnn cno cnr cns co- coc coe cof coi cok con coo cor cos crc cre crf cri crk crn cro crr crs csc cse csf csi csk csn cso csr css ec- ecc ece ecf eci eck ecn eco ecr ecs eec eee eef eek een eeo eer ees ef- efc efe eff efi efo efr efs eic eie eif eii eik ein eio eir eis ekc eke ekf eki eko ekr eks en- enc ene enf eni enk enn eno enr ens eo- eoc eoe eof eoi eok eon eoo eor eos erc ere erf eri erk ern ero err ers es- esc ese esf esi esk esn eso esr ess fcc fce fcf fci fck fcn fco fcr fcs fec fee fef fei fek fen feo fer fes ffc ffe fff ffi ffk ffn ffo ffr ffs fic fie fif fii fik fin fir fis fkc fkf fki fkk fnc fne fnf fni fnk fnn fnr fns foc foe fof foi fok fon foo for fos frc fre frf fri frk frn fro frr frs fsc fse fsf fsi fsk fsn fso fsr fss i-f icc ice icf ici ick icn ico icr ics ie- iec iee ief iei iek ien ier ies ifc ife iff ifi ifn ifo ifr ifs iic iie iif iii iin iio iir iis ikc ike ikf iki ikk iko ikr iks in- inc ine inf ini ink inn ino inr ins io- ioc ioe iof ioi ion ioo ior ios ir- irc ire irf iri irk irn iro irr irs is- isc ise isf isi isk isn iso isr iss kcc kce kci kck kcn kcr kcs ke- kec kee kef kei kek ken keo ker kes kfc kff kfi kfo kfs kic kie kif kii kik kin kio kir kis kkc kke kki kkk kkn kkr kks kn- knc kne knf kni knk knn kno knr koc koe kof koi kok kon koo kor kos krc krf kri krk krn kro krr krs ksc kse ksf ksi ksk ksn kso ksr kss n-i ncc nce ncf nci nck ncn nco ncr ncs ne- nec nee nef nei nek nen neo ner nes nfc nfe nff nfi nfk nfn nfo nfr nfs nic nie nif nii nik nin nio nir nis nkc nke nkf nki nkk nkn nko nkr nks nnc nne nnf nni nnk nnn nno nns no- noc noe nof noi nok non noo nor nos nrc nre nrf nri nrk nrn nro nrr nrs nsc nse nsf nsi nsk nsn nso nsr nss o-i oc- occ ocf oci ock ocn oco ocr ocs oec oee oef oei oen oeo oer oes of- ofc ofe off ofi ofn ofo ofr ofs oic oie oif oii oik oin oio oir ois okc oke oki okk oko okr oks on- onc one onf oni onk onn ono onr ons oo- ooc oof ooi ook oon ooo oor oos or- orc ore orf ori ork orn oro orr ors os- osc ose osf osi osk osn oso osr oss rcc rce rcf rci rcn rco rcr rcs re- rec ree ref rei rek ren reo rer res rfc rfe rff rfi rfk rfn rfo rfr rfs ric rie rif rii rik rin rio rir ris rkc rke rkf rkk rko rks rnc rni rnn rno rnr rns roc roe rof roi rok ron roo ror ros rrc rrf rri rrk rrn rrr rrs rsc rse rsf rsi rsk rsn rso rsr rss scc sce scf sci sck scn sco scr scs se- sec see sef sei sek sen seo ser ses sfc sfe sff sfi sfk sfn sfo sfr sfs sic sie sif sii sik sin sio sir sis sk- skc ske skf ski skk sko skr sks snc sne snf sni snk snn sno snr sns soc soe sof soi sok son soo sor sos sr- src sre srf sri srk srn sro srr srs ss- ssc sse ssf ssi ssk ssn sso ssr sss