ossb ossi osso ossu osum oubs oucc oufc ouff ouii ouir ouis oumi our- ouro ours ouu- rbbb rbbr rbbs rbis rbms rbss rcbc rcbo rccb rccc rccs rcfc rcic rcis rcms rcos rcsc rcsi rcss rffc rfic rib- ribo ribs ribu ricc rico rics riff rifs rifu riif riis rimi rimm rimo rims rimu riom rios riou riri rirs risc risi rism riso riss risu rius rmbs rmif rmsc rob- robb robi robo robs robu rocc roco rocs rofc roff rofo roif roio roir rois roiu romb romi romm romo roms roob roof rooi room roor roos rorc rori roro roru rosc rosi roso ross roub rouf roum rous rrfc rrif rrmc rrrr rrum rsbi rscc rscs rsfc rsis rsos rsum rubb rubi rubs rubu ruci rufc ruff rufo ruif ruis rumb rumi rumm rumo rums rurc ruri ruro rurs ruru rusi ruso russ rusu s-ib s-ic s-ii s-os sbbs sbcc sbcs sbfc sbic sbmc sbor sbsi sbus scbi sccc sccm sccs scfc scfi scfm sci- scic scif scim scio scir scis scmc scmm scmo scms scob scom scoo scor scr- scrc scri scrs scsc scsi scso scsr scsu scub scum scur sfbc sfcc sfco sfcs sffc sfio sfmm sfor sfos sfrc sfro sfss sfsu sibc sibi sibo sibs sibu sicc sici sicm sico sics sicu siff sifo sifr sifu siim simi simm simo sims sior sios siou sirc sirf siri siro sirr sirs siru sisc sisi siss sisu siui sium sius smbc smbf smcc smic smif smis smoc smof smos smrf smsc smss smur smus sobo sobr sobs sobu soci socm soco socr socs sofi sofo soic soif soim soir sois somb somi somm somo soof soom soor soos sorb sori sorm soro sorr sors soru sosi soso soss souf soum sour sous srbc srcc srfc srfi srib srim sris srmc sros srub ssbr sscc ssci sscs ssfc ssis ssmc ssoc ssrc ssri ssrm ssrs sssb sssc sssf sssi sssm ssss sub- subb subi subm subo subs suc- succ suci sucr sucs suf- sufc suff sufi sufr sufs sufu suio suir suis sum- sumi sumo sums sumu suor suos sur- surc surf suri suro surr surs suru sus- susi suso suss susu suum suus ubbi ubbo ubic ubii ubir ubis uboc ubos ucbc ucci ucfb ucio ucmc ucom ucos ucrc ucsb ucsc ucsf ucsm ucsu ufcu ufms ufos uims uirr umb- umbi umbo umff ummo umms umor umri umsu umus uocc uofm uofo uomo uor- urbi urbs urci urff urfi urib uric urif urim uris uriu urmi uro- urom uroo urri ursi urso urss ursu urum urur urus usbc usbr usbs uscc uscf uscm usco uscs usfc usfi usfs usif usim usis usmc usmm usms usoc usoi usos ussb ussc ussf ussr usss ussu usui usus uuoc uuri uusi uuuu