smr sms smt smx soc sod soe soi som soo sop sor sos sot sox spc spd spe spi spm spo spp spr sps spt spx sr- src srd sre sri srm sro srp srr srs srt srx ss- ssc ssd sse ssi ssm sso ssp ssr sss sst ssx stc std ste sti stm sto stp str sts stt stx sxc sxi sxm sxs sxt t-x tcc tcd tce tci tcm tco tcp tcr tcs tct tcx tdc tdd tde tdi tdm tdo tdp tdr tds tdt tdx te- tec ted tee tei tem teo tep ter tes tet tex tic tid tie tii tim tio tip tir tis tit tix tmc tmd tme tmi tmm tmo tmp tmr tms tmt tmx to- toc tod toe toi tom too top tor tos tot tox tpc tpd tpe tpi tpm tpo tpp tpr tps tpt tpx trc trd tre tri trm tro trp trr trs trt trx tsc tsd tse tsi tsm tso tsp tsr tss tst tsx ttc ttd tte tti ttm tto ttp ttr tts ttt ttx txe txi txs txt xcd xci xcp xcr xcx xdc xde xdi xdm xdr xds xdt xed xee xem xep xer xes xet xex xic xie xii xio xis xit xix xmc xmd xmi xmm xmo xmp xmr xms xmt xmx xoc xod xoi xom xoo xop xor xos xot xox xpc xpd xpe xpm xpo xpp xps xpt xrc xrd xrt xrx xsc xsi xsm xsp xss xst xtc xti xtm xtp xtr xts xtx xxi xxo xxp xxx