-ey c-- ccc cce cco ccs cct ccx ce- cec cee ceo ces cet cex cey co- coc coe coo cos cot cox coy csc cse cso css cst csx csy ctc cte cto cts ctt ctx cty cxc cxo cxs cxt cxx cyc cye cyo cys cyt ec- ecc ece eco ecs ect ecx eec eee eeo ees eet eex eey eo- eoc eoe eoo eos eot es- esc ese eso ess est esx esy etc ete eto ets ett etx ety ex- exc exe exo exs ext exx exy eyc eye eyo eys eyt oc- occ oco ocs oct ocx oec oee oeo oes oet oex oey oo- ooc ooo oos oot oox os- osc ose oso oss ost osx ot- otc ote oto ots ott ox- oxc oxo oxt oxx oxy oye oyo oys scc sce sco scs sct scx se- sec see seo ses set sex sey soc soe soo sos sot sox soy ss- ssc sse sso sss sst ssx stc ste sto sts stt stx sty sxc sxs sxt sy- syc sye sys syt syx t-x tcc tce tco tcs tct tcx te- tec tee teo tes tet tex tey to- toc toe too tos tot tox toy tsc tse tso tss tst tsx tsy ttc tte tto tts ttt ttx tty txe txs txt tyc tye tyo tys tyt xcx xee xes xet xex xoc xoo xos xot xox xsc xss xst xtc xts xtx xty xxo xxx xxy xyy ycc yce yco ycs ycy yec yee yeo yes yet yex yey yoc yoe yoo yos yot yox yoy ysc yse yso yss yst ysy ytc yte yto yts ytt yxe yxy yyc yye yys yyt yyy