-ic c-- ccc cci cco ccr ccs cct ccx ci- cic cii cio cir cis cit cix co- coc coi coo cor cos cot cox crc cri cro crr crs crt crx csc csi cso csr css cst csx ctc cti cto ctr cts ctt ctx cxc cxi cxo cxr cxs cxt cxx icc ici ico icr ics ict iic iii iio iir iis iit iix io- ioc ioi ioo ior ios iot ir- irc iri iro irr irs irt irx is- isc isi iso isr iss ist itc iti ito its itt itx ixc ixi o-i oc- occ oci oco ocr ocs oct ocx oic oii oio oir ois oit oo- ooc ooi ooo oor oos oot oox or- orc ori oro orr ors ort orx os- osc osi oso osr oss ost osx ot- otc oti oto otr ots ott ox- oxc oxi oxo oxt oxx rcc rci rco rcr rcs rct rcx ric rii rio rir ris rit rix roc roi roo ror ros rot rox rrc rri rrr rrs rrt rsc rsi rso rsr rss rst rsx rtc rti rto rtr rts rtt rtx rxr rxs scc sci sco scr scs sct scx sic sii sio sir sis sit six soc soi soo sor sos sot sox sr- src sri sro srr srs srt srx ss- ssc ssi sso ssr sss sst ssx stc sti sto str sts stt stx sxc sxi sxs sxt t-x tcc tci tco tcr tcs tct tcx tic tii tio tir tis tit tix to- toc toi too tor tos tot tox trc tri tro trr trs trt trx tsc tsi tso tsr tss tst tsx ttc tti tto ttr tts ttt ttx txi txs txt xci xcr xcx xic xii xio xis xit xix xoc xoi xoo xor xos xot xox xrc xrt xrx xsc xsi xss xst xtc xti xtr xts xtx xxi xxo xxx