-ic c-- ccc cci cco ccs cct ccx ci- cic cii cio cis cit cix co- coc coi coo cos cot cox csc csi cso css cst csx ctc cti cto cts ctt ctx cxc cxi cxo cxs cxt cxx icc ici ico ics ict iic iii iio iis iit iix io- ioc ioi ioo ios iot is- isc isi iso iss ist itc iti ito its itt itx ixc ixi o-i oc- occ oci oco ocs oct ocx oic oii oio ois oit oo- ooc ooi ooo oos oot oox os- osc osi oso oss ost osx ot- otc oti oto ots ott ox- oxc oxi oxo oxt oxx scc sci sco scs sct scx sic sii sio sis sit six soc soi soo sos sot sox ss- ssc ssi sso sss sst ssx stc sti sto sts stt stx sxc sxi sxs sxt t-x tcc tci tco tcs tct tcx tic tii tio tis tit tix to- toc toi too tos tot tox tsc tsi tso tss tst tsx ttc tti tto tts ttt ttx txi txs txt xci xcx xic xii xio xis xit xix xoc xoi xoo xos xot xox xsc xsi xss xst xtc xti xts xtx xxi xxo xxx