-ic c-- ccc cce cci ccs cct ccx ce- cec cee cei ces cet cex ci- cic cie cii cis cit cix csc cse csi css cst csx ctc cte cti cts ctt ctx cxc cxi cxs cxt cxx ec- ecc ece eci ecs ect ecx eec eee ees eet eex eic eie eii eis eit eix es- esc ese esi ess est esx etc ete eti ets ett etx ex- exc exe exi exs ext exx icc ice ici ics ict ie- iec iee iei ies iet iex iic iie iii iis iit iix is- isc ise isi iss ist itc ite iti its itt itx ixc ixe ixi scc sce sci scs sct scx se- sec see sei ses set sex sic sie sii sis sit six ss- ssc sse ssi sss sst ssx stc ste sti sts stt stx sxc sxi sxs sxt t-x tcc tce tci tcs tct tcx te- tec tee tei tes tet tex tic tie tii tis tit tix tsc tse tsi tss tst tsx ttc tte tti tts ttt ttx txe txi txs txt xci xcx xee xes xet xex xic xie xii xis xit xix xsc xsi xss xst xtc xti xts xtx xxi xxx