soi soo sop sor sos sot sox spa spc spe sph spi spo spp spr sps spt spx sr- sra src sre srh sri sro srp srr srs srt srx ss- ssa ssc sse ssh ssi sso ssp ssr sss sst ssx sta stc ste sth sti sto stp str sts stt stx sxc sxi sxs sxt t-x taa tac tae tah tai tao tap tar tas tat tax tca tcc tce tch tci tco tcp tcr tcs tct tcx te- tea tec tee teh tei teo tep ter tes tet tex th- tha thc the thh thi tho thp thr ths tht thx tia tic tie tih tii tio tip tir tis tit tix to- toa toc toe toh toi too top tor tos tot tox tpa tpc tpe tph tpi tpo tpp tpr tps tpt tpx tra trc tre trh tri tro trp trr trs trt trx tsa tsc tse tsh tsi tso tsp tsr tss tst tsx tta ttc tte tth tti tto ttp ttr tts ttt ttx txe txi txs txt xaa xac xap xar xas xat xch xci xcp xcr xcx xee xep xer xes xet xex xhp xht xia xic xie xii xio xis xit xix xoa xoc xoi xoo xop xor xos xot xox xpa xpc xpe xpo xpp xps xpt xrc xrt xrx xsa xsc xsi xsp xss xst xtc xti xtp xtr xts xtx xxi xxo xxp xxx