-er c-- ccc ccd cce ccn cco ccp ccr cdc cdd cde cdn cdo cdp cdr ce- cec ced cee cen ceo cep cer cn- cnc cnd cne cnn cno cnp cnr co- coc cod coe con coo cop cor cpc cpd cpe cpn cpo cpp cpr crc crd cre crn cro crp crr dcc dcd dce dcn dco dcp dcr ddc ddd dde ddn ddo ddp ddr de- dec ded dee den deo dep der dnc dnd dne dnn dno dnp dnr doc dod doe don doo dop dor dpc dpd dpe dpn dpo dpp dpr drc drd dre drn dro drp drr ec- ecc ecd ece ecn eco ecr ed- edc edd ede edn edo edp edr eec eed eee een eeo eep eer en- enc end ene enn eno enp enr eo- eoc eod eoe eon eoo eop eor ep- epc epd epe epn epo epp epr erc erd ere ern ero erp err ncc ncd nce ncn nco ncp ncr ndc ndd nde ndn ndo ndp ndr ne- nec ned nee nen neo nep ner nnc nne nnn nno nnp no- noc nod noe non noo nop nor npc npd npe npn npo npp npr nrc nrd nre nrn nro nrp nrr oc- occ ocd ocn oco ocp ocr odc odd ode odn odo odp odr oec oed oee oen oeo oep oer on- onc ond one onn ono onp onr oo- ooc ood oon ooo oop oor op- opc opd ope opn opo opp opr or- orc ord ore orn oro orp orr p-p pcc pcd pce pcn pco pcp pcr pdc pdd pde pdn pdo pdp pdr pec ped pee pen peo pep per pn- pnc pnd pne pnn pno pnp pnr poc pod poe pon poo pop por ppc ppd ppe ppn ppo ppp ppr prc prd pre prn pro prp prr rcc rcd rce rcn rco rcp rcr rdc rdd rde rdn rdo rdp rdr re- rec red ree ren reo rep rer rnc rnd rnn rno rnp rnr roc rod roe ron roo rop ror rpc rpd rpe rpn rpo rpp rpr rrc rrd rrn rrp rrr