sscs ssec ssee ssem sses ssmc ssoc ssra ssrc ssrm ssrs sssa sssb sssc sssm ssss suam suar suas sub- suba subb subm subo subs suc- succ sucr sucs suee suer sues sueu sum- suma sume sumo sums sumu suor suos sur- sura surc sure suro surr surs suru sus- susa suse suso suss susu suum suus uabc uaca uaes uamc uams uaoc uarc uars uaru uasa uaua ubac ubar ubba ubbe ubbo uber uboc ubos ubra ucam ucar ucas ucbc ucca ucea uces ucmc ucom ucos ucrc ucsa ucsb ucsc ucsm ucsu ucua ueba uers uess umaa umac umar umas umb- umba umbe umbo umec umer umes umma ummo umms umoe umor umra umsa umsu umus uocc uomo uor- uore urac urao uras urau urba urbe urbs urca ure- urea ures urma uro- uroa urom uroo urra urre ursa urse urso urss ursu urum urur urus us-a usaa usac usar usas usba usbc usbe usbr usbs usca uscc usce uscm usco uscs usea usee user uses usma usmc usme usmm usms usoc usoe usos usra ussa ussb ussc usse ussr usss ussu usua usus uuoc uuuu