spa spc spe spf sph spi spp spr sps spt spx sr- sra src sre srf srh sri srp srr srs srt srx ss- ssa ssc sse ssf ssh ssi ssp ssr sss sst ssx sta stc ste stf sth sti stp str sts stt stx sxc sxi sxs sxt t-x taa tac tae taf tah tai tap tar tas tat tax tca tcc tce tcf tch tci tcp tcr tcs tct tcx te- tea tec tee tef teh tei tep ter tes tet tex tfa tfc tfe tff tfh tfi tfp tfr tfs tft tfx th- tha thc the thf thh thi thp thr ths tht thx tia tic tie tif tih tii tip tir tis tit tix tpa tpc tpe tpf tph tpi tpp tpr tps tpt tpx tra trc tre trf trh tri trp trr trs trt trx tsa tsc tse tsf tsh tsi tsp tsr tss tst tsx tta ttc tte ttf tth tti ttp ttr tts ttt ttx txe txf txi txs txt xaa xac xaf xap xar xas xat xcf xch xci xcp xcr xcx xee xep xer xes xet xex xfa xfe xfh xfs xft xfx xhp xht xia xic xie xii xis xit xix xpa xpc xpe xpf xpp xps xpt xrc xrf xrt xrx xsa xsc xsi xsp xss xst xtc xtf xti xtp xtr xts xtx xxi xxp xxx