-er -ic c-- ccc cce cci cck ccn cco ccr ce- cec cee cei cek cen ceo cer ci- cic cie cii cik cin cio cir ckc cki cko cn- cnc cne cni cnn cno cnr co- coc coe coi cok con coo cor crc cre cri crk crn cro crr ec- ecc ece eci eck ecn eco ecr eec eee eek een eeo eer eic eie eii eik ein eio eir ekc eke eki eko ekr en- enc ene eni enk enn eno enr eo- eoc eoe eoi eok eon eoo eor erc ere eri erk ern ero err icc ice ici ick icn ico icr ie- iec iee iei iek ien ier iic iie iii iin iio iir ikc ike iki ikk iko ikr in- inc ine ini ink inn ino inr io- ioc ioe ioi ion ioo ior ir- irc ire iri irk irn iro irr kcc kce kci kck kcn kcr ke- kec kee kei kek ken keo ker kic kie kii kik kin kio kir kkc kke kki kkk kkn kkr kn- knc kne kni knk knn kno knr koc koe koi kok kon koo kor krc kri krk krn kro krr n-i ncc nce nci nck ncn nco ncr ne- nec nee nei nek nen neo ner nic nie nii nik nin nio nir nkc nke nki nkk nkn nko nkr nnc nne nni nnk nnn nno no- noc noe noi nok non noo nor nrc nre nri nrk nrn nro nrr o-i oc- occ oci ock ocn oco ocr oec oee oei oen oeo oer oic oie oii oik oin oio oir okc oke oki okk oko okr on- onc one oni onk onn ono onr oo- ooc ooi ook oon ooo oor or- orc ore ori ork orn oro orr rcc rce rci rcn rco rcr re- rec ree rei rek ren reo rer ric rie rii rik rin rio rir rkc rke rkk rko rnc rni rnn rno rnr roc roe roi rok ron roo ror rrc rri rrk rrn rrr