sie sii sin sio sir sis sit six sna snc snd sne sni snn sno snr sns snt soa soc sod soe soi son soo sor sos sot sox sr- sra src srd sre sri srn sro srr srs srt srx ss- ssa ssc ssd sse ssi ssn sso ssr sss sst ssx sta stc std ste sti stn sto str sts stt stx sxc sxi sxn sxs sxt t-x taa tac tad tae tai tan tao tar tas tat tax tca tcc tcd tce tci tcn tco tcr tcs tct tcx tda tdc tdd tde tdi tdn tdo tdr tds tdt tdx te- tea tec ted tee tei ten teo ter tes tet tex tia tic tid tie tii tin tio tir tis tit tix tna tnc tnd tne tni tnn tno tnr tns tnt tnx to- toa toc tod toe toi ton too tor tos tot tox tra trc trd tre tri trn tro trr trs trt trx tsa tsc tsd tse tsi tsn tso tsr tss tst tsx tta ttc ttd tte tti ttn tto ttr tts ttt ttx txe txi txn txs txt xaa xac xad xan xar xas xat xcd xci xcr xcx xda xdc xde xdi xdr xds xdt xed xee xen xer xes xet xex xia xic xie xii xin xio xis xit xix xna xnc xno xns xoa xoc xod xoi xon xoo xor xos xot xox xrc xrd xrt xrx xsa xsc xsi xss xst xtc xti xtr xts xtx xxi xxo xxx