-ic c-- ccc ccd cci cck cco ccr cdc cdd cdi cdk cdo cdr ci- cic cid cii cik cio cir ckc ckd cki cko co- coc cod coi cok coo cor crc crd cri crk cro crr dcc dcd dci dck dco dcr ddc ddd ddi ddk ddo ddr di- dic did dii dik dio dir dkc dki dkk dko dkr doc dod doi dok doo dor drc drd dri drk dro drr i-d icc icd ici ick ico icr idc idd idi idk ido idr iic iid iii iio iir ikc iki ikk iko ikr io- ioc iod ioi ioo ior ir- irc ird iri irk iro irr kcc kcd kci kck kcr kdc kdk kdo kdr kic kid kii kik kio kir kkc kki kkk kkr koc kod koi kok koo kor krc krd kri krk kro krr o-i oc- occ ocd oci ock oco ocr odc odd odi odo odr oic oid oii oik oio oir okc okd oki okk oko okr oo- ooc ood ooi ook ooo oor or- orc ord ori ork oro orr rcc rcd rci rco rcr rdc rdd rdi rdo rdr ric rid rii rik rio rir rkc rkk rko roc rod roi rok roo ror rrc rrd rri rrk rrr