sfo sfr sfs sft sfx sia sib sic sie sif sii sio sir sis sit six soa sob soc soe sof soi soo sor sos sot sox sr- sra srb src sre srf sri sro srr srs srt srx ss- ssa ssb ssc sse ssf ssi sso ssr sss sst ssx sta stb stc ste stf sti sto str sts stt stx sxc sxi sxs sxt t-x taa tab tac tae taf tai tao tar tas tat tax tba tbb tbc tbe tbf tbi tbo tbr tbs tbt tca tcb tcc tce tcf tci tco tcr tcs tct tcx te- tea teb tec tee tef tei teo ter tes tet tex tfa tfb tfc tfe tff tfi tfo tfr tfs tft tfx tia tib tic tie tif tii tio tir tis tit tix to- toa tob toc toe tof toi too tor tos tot tox tra trb trc tre trf tri tro trr trs trt trx tsa tsb tsc tse tsf tsi tso tsr tss tst tsx tta ttb ttc tte ttf tti tto ttr tts ttt ttx txe txf txi txs txt xaa xac xaf xar xas xat xbc xbe xbr xbx xcb xcf xci xcr xcx xee xer xes xet xex xfa xfe xfs xft xfx xia xic xie xii xio xis xit xix xoa xoc xof xoi xoo xor xos xot xox xrc xrf xrt xrx xsa xsb xsc xsi xss xst xtc xtf xti xtr xts xtx xxi xxo xxx