spa spd spe spl spn spo spp spr sps spt spx sr- sra srd sre srl srn sro srp srr srs srt srx ss- ssa ssd sse ssl ssn sso ssp ssr sss sst ssx sta std ste stl stn sto stp str sts stt stx sxl sxn sxs sxt t-x taa tad tae tal tan tao tap tar tas tat tax tda tdd tde tdl tdn tdo tdp tdr tds tdt tdx te- tea ted tee tel ten teo tep ter tes tet tex tla tld tle tll tln tlo tlp tlr tls tlt tlx tna tnd tne tnl tnn tno tnp tnr tns tnt tnx to- toa tod toe tol ton too top tor tos tot tox tpa tpd tpe tpl tpn tpo tpp tpr tps tpt tpx tra trd tre trl trn tro trp trr trs trt trx tsa tsd tse tsl tsn tso tsp tsr tss tst tsx tta ttd tte ttl ttn tto ttp ttr tts ttt ttx txe txl txn txs txt xaa xad xal xan xap xar xas xat xda xde xdr xds xdt xed xee xel xen xep xer xes xet xex xla xld xlr xls xlt xna xno xns xoa xod xon xoo xop xor xos xot xox xpa xpd xpe xpl xpn xpo xpp xps xpt xrd xrt xrx xsa xsl xsp xss xst xtp xtr xts xtx xxl xxo xxp xxx