-er -ic c-- ccc cce cch cci cco ccp ccr ccx ce- cec cee ceh cei ceo cep cer cex ch- chc che chh chi cho chp chr chx ci- cic cie cih cii cio cip cir cix co- coc coe coh coi coo cop cor cox cpc cpe cph cpi cpo cpp cpr cpx crc cre crh cri cro crp crr crx cxc cxh cxi cxo cxp cxr cxx ec- ecc ece ech eci eco ecr ecx eec eee eeo eep eer eex ehc ehe ehh ehi eho ehp ehr eic eie eii eio eip eir eix eo- eoc eoe eoh eoi eoo eop eor ep- epc epe eph epi epo epp epr epx erc ere erh eri ero erp err ex- exc exe exh exi exo exp exr exx h-i hcc hce hch hci hco hcp hcr he- hec hee heh hei heo hep her hex hhc hhe hhh hhi hho hhp hhr hic hie hih hii hio hip hir hix hoc hoe hoh hoi hoo hop hor hox hpc hpe hph hpi hpo hpp hpr hr- hrc hre hrh hri hro hrp hrr hxc icc ice ich ici ico icp icr ie- iec iee iei iep ier iex ihc ihe ihh ihi iho ihp ihr iic iie iih iii iio iip iir iix io- ioc ioe ioh ioi ioo iop ior ipc ipe ipi ipo ipp ipr ipx ir- irc ire iri iro irp irr irx ixc ixe ixi o-i oc- occ och oci oco ocp ocr ocx oec oee oeh oei oeo oep oer oex ohc ohe ohh ohi oho ohp ohr oic oie oii oio oip oir oo- ooc ooh ooi ooo oop oor oox op- opc ope oph opi opo opp opr opx or- orc ore orh ori oro orp orr orx ox- oxc oxi oxo oxx p-p pcc pce pch pci pco pcp pcr pcx pec pee peh pei peo pep per pex phc phe phi pho php phr phx pic pie pih pii pio pip pir pix poc poe poh poi poo pop por pox ppc ppe pph ppi ppo ppp ppr ppx prc pre prh pri pro prp prr prx pxc pxe pxr rcc rce rch rci rco rcp rcr rcx re- rec ree reh rei reo rep rer rex rh- rhc rhe rhh rhi rho rhp rhr ric rie rih rii rio rip rir rix roc roe roh roi roo rop ror rox rpc rpe rph rpi rpo rpp rpr rpx rrc rrh rri rrp rrr rxp rxr xch xci xcp xcr xcx xee xep xer xex xhp xic xie xii xio xix xoc xoi xoo xop xor xox xpc xpe xpo xpp xrc xrx xxi xxo xxp xxx