sks skt snb snd sne snf snj snk snn sno snr sns snt sob sod soe sof soj sok son soo sor sos sot sr- srb srd sre srf srj srk srn sro srr srs srt ss- ssb ssd sse ssf ssj ssk ssn sso ssr sss sst stb std ste stf stj stk stn sto str sts stt tbb tbd tbe tbf tbj tbk tbn tbo tbr tbs tbt tdb tdd tde tdf tdk tdn tdo tdr tds tdt te- teb ted tee tef tej tek ten teo ter tes tet tfb tfd tfe tff tfj tfk tfn tfo tfr tfs tft tjd tje tjf tjo tjr tjs tkb tke tkk tko tkr tks tkt tnb tnd tne tnf tnk tnn tno tnr tns tnt to- tob tod toe tof toj tok ton too tor tos tot trb trd tre trf trk trn tro trr trs trt tsb tsd tse tsf tsj tsk tsn tso tsr tss tst ttb ttd tte ttf ttk ttn tto ttr tts ttt