snp snr sns snt soa soc sod soe sof soi som son soo sop sor sos sot spa spc spd spe spf spi spm spn spo spp spr sps spt sr- sra src srd sre srf sri srm srn sro srp srr srs srt ss- ssa ssc ssd sse ssf ssi ssm ssn sso ssp ssr sss sst sta stc std ste stf sti stm stn sto stp str sts stt taa tac tad tae taf tai tam tan tao tap tar tas tat tca tcc tcd tce tcf tci tcm tcn tco tcp tcr tcs tct tda tdc tdd tde tdf tdi tdm tdn tdo tdp tdr tds tdt te- tea tec ted tee tef tei tem ten teo tep ter tes tet tfa tfc tfd tfe tff tfi tfm tfn tfo tfp tfr tfs tft tia tic tid tie tif tii tim tin tio tip tir tis tit tma tmc tmd tme tmf tmi tmm tmn tmo tmp tmr tms tmt tna tnc tnd tne tnf tni tnm tnn tno tnp tnr tns tnt to- toa toc tod toe tof toi tom ton too top tor tos tot tpa tpc tpd tpe tpf tpi tpm tpn tpo tpp tpr tps tpt tra trc trd tre trf tri trm trn tro trp trr trs trt tsa tsc tsd tse tsf tsi tsm tsn tso tsp tsr tss tst tta ttc ttd tte ttf tti ttm ttn tto ttp ttr tts ttt