sobo sobs sobu soca soci soco socs soga sogi sogo sogs soia soic sois soog soos sosa sosi soso soss sous ssaa ssab ssac ssao ssas ssau ssca sscc ssci sscs ssgs ssis ssoc sssa sssb sssc sssi ssss suas sub- suba subb subg subi subo subs suc- succ suci sucs sug- suga sugg sugi sugo suig suio suis suos sus- susa susi suso suss susu suus uabc uaca uaoc uasa uaua ubac ubba ubbi ubbo ubic ubii ubis uboc ubos ucai ucas ucbc ucca ucci ucio ucos ucsa ucsb ucsc ucsu ucua ugab ugao ugcc ugcg uggo uggs ugia ugis ugos uguu uica uocc us-a usaa usac usag usas usba usbc usbs usca uscc uscg usco uscs usga usgo usia usis usoc usog usoi usos ussa ussb ussc usss ussu usua usui usus uuoc uusi uuuu