srd sre srh srn sro srp srr srs srt srx ss- ssa ssd sse ssh ssn sso ssp ssr sss sst ssx sta std ste sth stn sto stp str sts stt stx sxn sxs sxt t-x taa tad tae tah tan tao tap tar tas tat tax tda tdd tde tdh tdn tdo tdp tdr tds tdt tdx te- tea ted tee teh ten teo tep ter tes tet tex th- tha thd the thh thn tho thp thr ths tht thx tna tnd tne tnh tnn tno tnp tnr tns tnt tnx to- toa tod toe toh ton too top tor tos tot tox tpa tpd tpe tph tpn tpo tpp tpr tps tpt tpx tra trd tre trh trn tro trp trr trs trt trx tsa tsd tse tsh tsn tso tsp tsr tss tst tsx tta ttd tte tth ttn tto ttp ttr tts ttt ttx txe txn txs txt xaa xad xan xap xar xas xat xda xde xdh xdr xds xdt xed xee xen xep xer xes xet xex xhd xhp xht xna xno xns xoa xod xon xoo xop xor xos xot xox xpa xpd xpe xpn xpo xpp xps xpt xrd xrt xrx xsa xsp xss xst xtp xtr xts xtx xxo xxp xxx