spi spk spn spo spp spr sps spt spu sr- src srg sri srk srn sro srp srr srs srt ss- ssc ssg ssi ssk ssn sso ssp ssr sss sst ssu stc stg sti stk stn sto stp str sts stt stu suc sug sui suk sun suo sup sur sus sut suu tcc tcg tci tck tcn tco tcp tcr tcs tct tcu tgc tgg tgi tgk tgn tgo tgp tgr tgs tgt tgu tic tig tii tik tin tio tip tir tis tit tiu tkc tkg tkk tko tkp tkr tks tkt tnc tng tni tnk tnn tno tnp tnr tns tnt to- toc tog toi tok ton too top tor tos tot tou tpc tpg tpi tpk tpn tpo tpp tpr tps tpt tpu trc trg tri trk trn tro trp trr trs trt tru tsc tsg tsi tsk tsn tso tsp tsr tss tst tsu ttc ttg tti ttk ttn tto ttp ttr tts ttt ttu tuc tug tui tuk tun tuo tup tur tus tut tuu ucc ucg uci uck ucn uco ucp ucr ucs uct ucu ugc ugg ugi ugk ugn ugo ugp ugr ugs ugt ugu uic uig uii uin uio uip uir uis uit uiu ukc uki ukk ukn ukp ukr uku un- unc ung uni unk unn uno unp unr uns unt unu uoc uog uok uon uoo uop uor uos uot up- upc upg upi upk upn upo upp upr ups upt upu ur- urc urg uri urk urn uro urp urr urs urt uru usc usg usi usk usn uso usp usr uss ust usu utc uti utk utn uto utp utr uts utt utu uuc uug uun uur uus uut uuu