sie sif sii sim sio sip sis sit six sma smd sme smf smi smm smo smp sms smt smx soa sod soe sof soi som soo sop sos sot sox spa spd spe spf spi spm spo spp sps spt spx ss- ssa ssd sse ssf ssi ssm sso ssp sss sst ssx sta std ste stf sti stm sto stp sts stt stx sxi sxm sxs sxt t-x taa tad tae taf tai tam tao tap tas tat tax tda tdd tde tdf tdi tdm tdo tdp tds tdt tdx te- tea ted tee tef tei tem teo tep tes tet tex tfa tfd tfe tff tfi tfm tfo tfp tfs tft tfx tia tid tie tif tii tim tio tip tis tit tix tma tmd tme tmf tmi tmm tmo tmp tms tmt tmx to- toa tod toe tof toi tom too top tos tot tox tpa tpd tpe tpf tpi tpm tpo tpp tps tpt tpx tsa tsd tse tsf tsi tsm tso tsp tss tst tsx tta ttd tte ttf tti ttm tto ttp tts ttt ttx txe txf txi txs txt xaa xad xaf xam xap xas xat xda xde xdf xdi xdm xds xdt xed xee xem xep xes xet xex xfa xfe xfm xfs xft xfx xia xie xii xio xis xit xix xma xmd xmf xmi xmm xmo xmp xms xmt xmx xoa xod xof xoi xom xoo xop xos xot xox xpa xpd xpe xpf xpm xpo xpp xps xpt xsa xsi xsm xsp xss xst xtf xti xtm xtp xts xtx xxi xxo xxp xxx