spn spo spp spr sps spt spx sr- sra srd sre srg srn sro srp srr srs srt srx ss- ssa ssd sse ssg ssn sso ssp ssr sss sst ssx sta std ste stg stn sto stp str sts stt stx sxn sxs sxt t-x taa tad tae tag tan tao tap tar tas tat tax tda tdd tde tdg tdn tdo tdp tdr tds tdt tdx te- tea ted tee teg ten teo tep ter tes tet tex tga tge tgg tgn tgo tgp tgr tgs tgt tna tnd tne tng tnn tno tnp tnr tns tnt tnx to- toa tod toe tog ton too top tor tos tot tox tpa tpd tpe tpg tpn tpo tpp tpr tps tpt tpx tra trd tre trg trn tro trp trr trs trt trx tsa tsd tse tsg tsn tso tsp tsr tss tst tsx tta ttd tte ttg ttn tto ttp ttr tts ttt ttx txe txn txs txt xaa xad xag xan xap xar xas xat xda xde xdr xds xdt xed xee xeg xen xep xer xes xet xex xge xgp xna xno xns xoa xod xog xon xoo xop xor xos xot xox xpa xpd xpe xpg xpn xpo xpp xps xpt xrd xrt xrx xsa xsp xss xst xtp xtr xts xtx xxo xxp xxx