-er c-- c-j ccc cce ccf ccj cco ccr ce- cec cee cef cej ceo cer cfc cfe cff cfo cfr cjc cjf cjr co- coc coe cof coj coo cor crc cre crf crj cro crr ec- ecc ece ecf ecj eco ecr eec eee eef eeo eer ef- efc efe eff efo efr ejc ejf ejo eo- eoc eoe eof eoo eor erc ere erf ero err fcc fce fcf fcj fco fcr fec fee fef feo fer ffc ffe fff ffo ffr fjc foc foe fof foo for frc fre frf frj fro frr jcc jce jcf jco jcr jec jee jef jej jeo jer jfc jfe jff jfj jfo jfr jjc jjf jjj jjr joc joe jof joj joo jor jrc jrf jro jrr oc- occ ocf ocj oco ocr oec oee oef oeo oer of- ofc ofe off ofo ofr ojc oje ojo oo- ooc oof ooo oor or- orc ore orf oro orr rcc rce rcf rcj rco rcr re- rec ree ref reo rer rfc rfe rff rfj rfo rfr rjc rjf rjr roc roe rof roj roo ror rrc rrf rrr