-er -ic c-- ccc ccd cce cci cco ccp ccr ccx cdc cdd cde cdi cdo cdp cdr cdx ce- cec ced cee cei ceo cep cer cex ci- cic cid cie cii cio cip cir cix co- coc cod coe coi coo cop cor cox cpc cpd cpe cpi cpo cpp cpr cpx crc crd cre cri cro crp crr crx cxc cxi cxo cxp cxr cxx dcc dcd dce dci dco dcp dcr dcx ddc ddd dde ddi ddo ddp ddr ddx de- dec ded dee dei deo dep der dex di- dic did die dii dio dip dir dix doc dod doe doi doo dop dor dox dpc dpd dpe dpi dpo dpp dpr drc drd dre dri dro drp drr drx dxc dxd dxi dxo dxp dxr dxx ec- ecc ecd ece eci eco ecr ecx ed- edc edd ede edi edo edp edr edx eec eed eee eeo eep eer eex eic eid eie eii eio eip eir eix eo- eoc eod eoe eoi eoo eop eor ep- epc epd epe epi epo epp epr epx erc erd ere eri ero erp err ex- exc exd exe exi exo exp exr exx i-d icc icd ice ici ico icp icr idc idd ide idi ido idp idr idx ie- iec ied iee iei iep ier iex iic iid iie iii iio iip iir iix io- ioc iod ioe ioi ioo iop ior ipc ipd ipe ipi ipo ipp ipr ipx ir- irc ird ire iri iro irp irr irx ixc ixe ixi o-i oc- occ ocd oci oco ocp ocr ocx odc odd ode odi odo odp odr oec oed oee oei oeo oep oer oex oic oid oie oii oio oip oir oo- ooc ood ooi ooo oop oor oox op- opc opd ope opi opo opp opr opx or- orc ord ore ori oro orp orr orx ox- oxc oxi oxo oxx p-p pcc pcd pce pci pco pcp pcr pcx pdc pdd pde pdi pdo pdp pdr pdx pec ped pee pei peo pep per pex pic pid pie pii pio pip pir pix poc pod poe poi poo pop por pox ppc ppd ppe ppi ppo ppp ppr ppx prc prd pre pri pro prp prr prx pxc pxe pxr rcc rcd rce rci rco rcp rcr rcx rdc rdd rde rdi rdo rdp rdr rdx re- rec red ree rei reo rep rer rex ric rid rie rii rio rip rir rix roc rod roe roi roo rop ror rox rpc rpd rpe rpi rpo rpp rpr rpx rrc rrd rri rrp rrr rxp rxr xcd xci xcp xcr xcx xdc xde xdi xdr xed xee xep xer xex xic xie xii xio xix xoc xod xoi xoo xop xor xox xpc xpd xpe xpo xpp xrc xrd xrx xxi xxo xxp xxx