-er -ic c-- ccc cce cci cco ccr cct ccx ce- cec cee cei ceo cer cet cex ci- cic cie cii cio cir cit cix co- coc coe coi coo cor cot cox crc cre cri cro crr crt crx ctc cte cti cto ctr ctt ctx cxc cxi cxo cxr cxt cxx ec- ecc ece eci eco ecr ect ecx eec eee eeo eer eet eex eic eie eii eio eir eit eix eo- eoc eoe eoi eoo eor eot erc ere eri ero err ert etc ete eti eto etr ett etx ex- exc exe exi exo exr ext exx icc ice ici ico icr ict ie- iec iee iei ier iet iex iic iie iii iio iir iit iix io- ioc ioe ioi ioo ior iot ir- irc ire iri iro irr irt irx itc ite iti ito itt itx ixc ixe ixi o-i oc- occ oci oco ocr oct ocx oec oee oei oeo oer oet oex oic oie oii oio oir oit oo- ooc ooi ooo oor oot oox or- orc ore ori oro orr ort orx ot- otc ote oti oto otr ott ox- oxc oxi oxo oxt oxx rcc rce rci rco rcr rct rcx re- rec ree rei reo rer ret rex ric rie rii rio rir rit rix roc roe roi roo ror rot rox rrc rri rrr rrt rtc rte rti rto rtr rtt rtx rxr t-x tcc tce tci tco tcr tct tcx te- tec tee tei teo ter tet tex tic tie tii tio tir tit tix to- toc toe toi too tor tot tox trc tre tri tro trr trt trx ttc tte tti tto ttr ttt ttx txe txi txt xci xcr xcx xee xer xet xex xic xie xii xio xit xix xoc xoi xoo xor xot xox xrc xrt xrx xtc xti xtr xtx xxi xxo xxx