-er -ic c-- ccc cce cci cco ccr ccs ccx ce- cec cee cei ceo cer ces cex ci- cic cie cii cio cir cis cix co- coc coe coi coo cor cos cox crc cre cri cro crr crs crx csc cse csi cso csr css csx cxc cxi cxo cxr cxs cxx ec- ecc ece eci eco ecr ecs ecx eec eee eeo eer ees eex eic eie eii eio eir eis eix eo- eoc eoe eoi eoo eor eos erc ere eri ero err ers es- esc ese esi eso esr ess esx ex- exc exe exi exo exr exs exx icc ice ici ico icr ics ie- iec iee iei ier ies iex iic iie iii iio iir iis iix io- ioc ioe ioi ioo ior ios ir- irc ire iri iro irr irs irx is- isc ise isi iso isr iss ixc ixe ixi o-i oc- occ oci oco ocr ocs ocx oec oee oei oeo oer oes oex oic oie oii oio oir ois oo- ooc ooi ooo oor oos oox or- orc ore ori oro orr ors orx os- osc ose osi oso osr oss osx ox- oxc oxi oxo oxx rcc rce rci rco rcr rcs rcx re- rec ree rei reo rer res rex ric rie rii rio rir ris rix roc roe roi roo ror ros rox rrc rri rrr rrs rsc rse rsi rso rsr rss rsx rxr rxs scc sce sci sco scr scs scx se- sec see sei seo ser ses sex sic sie sii sio sir sis six soc soe soi soo sor sos sox sr- src sre sri sro srr srs srx ss- ssc sse ssi sso ssr sss ssx sxc sxi sxs xci xcr xcx xee xer xes xex xic xie xii xio xis xix xoc xoi xoo xor xos xox xrc xrx xsc xsi xss xxi xxo xxx