sii sin sio sip sis sit six sna snb snd sne sni snn sno snp sns snt soa sob sod soe soi son soo sop sos sot sox spa spb spd spe spi spn spo spp sps spt spx ss- ssa ssb ssd sse ssi ssn sso ssp sss sst ssx sta stb std ste sti stn sto stp sts stt stx sxi sxn sxs sxt t-x taa tab tad tae tai tan tao tap tas tat tax tba tbb tbd tbe tbi tbn tbo tbp tbs tbt tda tdb tdd tde tdi tdn tdo tdp tds tdt tdx te- tea teb ted tee tei ten teo tep tes tet tex tia tib tid tie tii tin tio tip tis tit tix tna tnb tnd tne tni tnn tno tnp tns tnt tnx to- toa tob tod toe toi ton too top tos tot tox tpa tpb tpd tpe tpi tpn tpo tpp tps tpt tpx tsa tsb tsd tse tsi tsn tso tsp tss tst tsx tta ttb ttd tte tti ttn tto ttp tts ttt ttx txe txi txn txs txt xaa xad xan xap xas xat xbe xbx xda xdb xde xdi xds xdt xed xee xen xep xes xet xex xia xie xii xin xio xis xit xix xna xno xns xoa xod xoi xon xoo xop xos xot xox xpa xpb xpd xpe xpn xpo xpp xps xpt xsa xsb xsi xsp xss xst xti xtp xts xtx xxi xxo xxp xxx