scd scg scn sco scr scs sct scu sda sdb sdc sdd sdg sdn sdo sdr sds sdt sdu sga sgb sgc sgd sgg sgn sgo sgr sgs sgt sgu sna snb snc snd sng snn sno snr sns snt snu soa sob soc sod sog son soo sor sos sot sou sr- sra srb src srd srg srn sro srr srs srt ss- ssa ssb ssc ssd ssg ssn sso ssr sss sst ssu sta stb stc std stg stn sto str sts stt stu sua sub suc sud sug sun suo sur sus sut suu taa tab tac tad tag tan tao tar tas tat tau tba tbb tbc tbd tbg tbn tbo tbr tbs tbt tbu tca tcb tcc tcd tcg tcn tco tcr tcs tct tcu tda tdb tdc tdd tdg tdn tdo tdr tds tdt tdu tga tgb tgc tgg tgn tgo tgr tgs tgt tgu tna tnb tnc tnd tng tnn tno tnr tns tnt to- toa tob toc tod tog ton too tor tos tot tou tra trb trc trd trg trn tro trr trs trt tru tsa tsb tsc tsd tsg tsn tso tsr tss tst tsu tta ttb ttc ttd ttg ttn tto ttr tts ttt ttu tua tub tuc tud tug tun tuo tur tus tut tuu ua- uaa uab uac uad uag uan uao uar uas uat uau uba ubb ubc ubg ubn ubo ubr ubs ubt ubu uca ucb ucc ucd ucg ucn uco ucr ucs uct ucu uda udb udc udd udg udn udo udr uds udt udu uga ugb ugc ugg ugn ugo ugr ugs ugt ugu un- una unb unc und ung unn uno unr uns unt unu uoa uob uoc uod uog uon uoo uor uos uot ur- ura urb urc urd urg urn uro urr urs urt uru usa usb usc usd usg usn uso usr uss ust usu uta utb utc utd utn uto utr uts utt utu uua uuc uug uun uur uus uut uuu