-er -ic c-- ccc ccd cce cci cck ccn cco ccr cdc cdd cde cdi cdk cdn cdo cdr ce- cec ced cee cei cek cen ceo cer ci- cic cid cie cii cik cin cio cir ckc ckd cki cko cn- cnc cnd cne cni cnn cno cnr co- coc cod coe coi cok con coo cor crc crd cre cri crk crn cro crr dcc dcd dce dci dck dcn dco dcr ddc ddd dde ddi ddk ddn ddo ddr de- dec ded dee dei dek den deo der di- dic did die dii dik din dio dir dkc dke dki dkk dko dkr dnc dnd dne dni dnk dnn dno dnr doc dod doe doi dok don doo dor drc drd dre dri drk drn dro drr ec- ecc ecd ece eci eck ecn eco ecr ed- edc edd ede edi edk edn edo edr eec eed eee eek een eeo eer eic eid eie eii eik ein eio eir ekc ekd eke eki eko ekr en- enc end ene eni enk enn eno enr eo- eoc eod eoe eoi eok eon eoo eor erc erd ere eri erk ern ero err i-d icc icd ice ici ick icn ico icr idc idd ide idi idk idn ido idr ie- iec ied iee iei iek ien ier iic iid iie iii iin iio iir ikc ike iki ikk iko ikr in- inc ind ine ini ink inn ino inr io- ioc iod ioe ioi ion ioo ior ir- irc ird ire iri irk irn iro irr kcc kcd kce kci kck kcn kcr kdc kde kdk kdo kdr ke- kec ked kee kei kek ken keo ker kic kid kie kii kik kin kio kir kkc kke kki kkk kkn kkr kn- knc knd kne kni knk knn kno knr koc kod koe koi kok kon koo kor krc krd kri krk krn kro krr n-i ncc ncd nce nci nck ncn nco ncr ndc ndd nde ndi ndk ndn ndo ndr ne- nec ned nee nei nek nen neo ner nic nid nie nii nik nin nio nir nkc nke nki nkk nkn nko nkr nnc nne nni nnk nnn nno no- noc nod noe noi nok non noo nor nrc nrd nre nri nrk nrn nro nrr o-i oc- occ ocd oci ock ocn oco ocr odc odd ode odi odn odo odr oec oed oee oei oen oeo oer oic oid oie oii oik oin oio oir okc okd oke oki okk oko okr on- onc ond one oni onk onn ono onr oo- ooc ood ooi ook oon ooo oor or- orc ord ore ori ork orn oro orr rcc rcd rce rci rcn rco rcr rdc rdd rde rdi rdn rdo rdr re- rec red ree rei rek ren reo rer ric rid rie rii rik rin rio rir rkc rke rkk rko rnc rnd rni rnn rno rnr roc rod roe roi rok ron roo ror rrc rrd rri rrk rrn rrr