sfc sfd sfe sff sfi sfn sfo sfs sft sfx sia sic sid sie sif sii sin sio sis sit six sna snc snd sne snf sni snn sno sns snt soa soc sod soe sof soi son soo sos sot sox ss- ssa ssc ssd sse ssf ssi ssn sso sss sst ssx sta stc std ste stf sti stn sto sts stt stx sxc sxi sxn sxs sxt t-x taa tac tad tae taf tai tan tao tas tat tax tca tcc tcd tce tcf tci tcn tco tcs tct tcx tda tdc tdd tde tdf tdi tdn tdo tds tdt tdx te- tea tec ted tee tef tei ten teo tes tet tex tfa tfc tfd tfe tff tfi tfn tfo tfs tft tfx tia tic tid tie tif tii tin tio tis tit tix tna tnc tnd tne tnf tni tnn tno tns tnt tnx to- toa toc tod toe tof toi ton too tos tot tox tsa tsc tsd tse tsf tsi tsn tso tss tst tsx tta ttc ttd tte ttf tti ttn tto tts ttt ttx txe txf txi txn txs txt xaa xac xad xaf xan xas xat xcd xcf xci xcx xda xdc xde xdf xdi xds xdt xed xee xen xes xet xex xfa xfe xfn xfs xft xfx xia xic xie xii xin xio xis xit xix xna xnc xno xns xoa xoc xod xof xoi xon xoo xos xot xox xsa xsc xsi xss xst xtc xtf xti xts xtx xxi xxo xxx