-ic c-- ccc cce cci cco ccs cct ccx ce- cec cee cei ceo ces cet cex ci- cic cie cii cio cis cit cix co- coc coe coi coo cos cot cox csc cse csi cso css cst csx ctc cte cti cto cts ctt ctx cxc cxi cxo cxs cxt cxx ec- ecc ece eci eco ecs ect ecx eec eee eeo ees eet eex eic eie eii eio eis eit eix eo- eoc eoe eoi eoo eos eot es- esc ese esi eso ess est esx etc ete eti eto ets ett etx ex- exc exe exi exo exs ext exx icc ice ici ico ics ict ie- iec iee iei ies iet iex iic iie iii iio iis iit iix io- ioc ioe ioi ioo ios iot is- isc ise isi iso iss ist itc ite iti ito its itt itx ixc ixe ixi o-i oc- occ oci oco ocs oct ocx oec oee oei oeo oes oet oex oic oie oii oio ois oit oo- ooc ooi ooo oos oot oox os- osc ose osi oso oss ost osx ot- otc ote oti oto ots ott ox- oxc oxi oxo oxt oxx scc sce sci sco scs sct scx se- sec see sei seo ses set sex sic sie sii sio sis sit six soc soe soi soo sos sot sox ss- ssc sse ssi sso sss sst ssx stc ste sti sto sts stt stx sxc sxi sxs sxt t-x tcc tce tci tco tcs tct tcx te- tec tee tei teo tes tet tex tic tie tii tio tis tit tix to- toc toe toi too tos tot tox tsc tse tsi tso tss tst tsx ttc tte tti tto tts ttt ttx txe txi txs txt xci xcx xee xes xet xex xic xie xii xio xis xit xix xoc xoi xoo xos xot xox xsc xsi xss xst xtc xti xts xtx xxi xxo xxx