sre srf sri srl srn sro srr srs srt srx ss- ssc sse ssf ssi ssl ssn sso ssr sss sst ssx stc ste stf sti stl stn sto str sts stt stx sxc sxi sxl sxn sxs sxt t-x tcc tce tcf tci tcl tcn tco tcr tcs tct tcx te- tec tee tef tei tel ten teo ter tes tet tex tfc tfe tff tfi tfl tfn tfo tfr tfs tft tfx tic tie tif tii til tin tio tir tis tit tix tlc tle tlf tli tll tln tlo tlr tls tlt tlx tnc tne tnf tni tnl tnn tno tnr tns tnt tnx to- toc toe tof toi tol ton too tor tos tot tox trc tre trf tri trl trn tro trr trs trt trx tsc tse tsf tsi tsl tsn tso tsr tss tst tsx ttc tte ttf tti ttl ttn tto ttr tts ttt ttx txe txf txi txl txn txs txt xcf xci xcl xcr xcx xee xel xen xer xes xet xex xfe xfl xfn xfs xft xfx xic xie xii xin xio xis xit xix xlf xli xlr xls xlt xnc xno xns xoc xof xoi xon xoo xor xos xot xox xrc xrf xrt xrx xsc xsi xsl xss xst xtc xtf xti xtr xts xtx xxi xxl xxo xxx