fefe feff fera ferb ferc ferd fere ferr fers fesa fese fess ffar ffcc ffee ffff ffrr ffsa ffss frab frac frad frae fras frbc frcc frea fred free fres frfc frsb frsc fsas fscb fscc fsec fsra fssa fssc fssf raab raad raaf raas raba rabb rabe rabs rac- raca racc race racs rada radc radd rade radr rads raec raed raef raer raes rafa rafc rafe raff rara rarb rare rarf rars rasa rasc rasd rase rass rbaf rbbb rbbr rbbs rbds rbsd rbss rcac rcaf rcas rcbc rccb rccc rccs rcdc rcde rcds rcfc rcrd rcsa rcsc rcsd rcss rdac rdas rder rdfa rea- reac read reae reaf rear reas reba rebb rebe rebs reca recc recd rece recr recs reda redc redd rede redr reds reeb reed reef rees refd refe reff refr refs rera rerd rere rers resa rese ress rfae rfds rfef rffc rrad rras rred rrfc rrrr rsaa rsaf rscc rscs rsdd rsds rsee rsfc rsre rssa sa-c saab saac saad saae saaf saar saas saba sabb sabc sabe sabr sabs saca sacc sacd sace sacr sacs sada sadb sadc sadd sade sadr sads saeb saer saes safa safb safc safe saff safr sara sarc sard sare sarf sarr sars sasa sasc sasd sase sasf sass sbaa sbac sbar sbas sbbs sbca sbcc sbcs sbds sbef sber sbfc sbsa sbsd sbse scaa scab scac scad scaf scar scas scba sccc scce sccs scda scdc scdf scds scea scec scee scer scfa scfc scfe scr- scra scrc scre scrs scsa scsc scsd scsr sdae sdba sdcc sddc sdds sdef sder sdes sdfc sdrc sdrs sdsc sdsf sdss se-c se-d se-e se-f se-s seaa seab seac sead seaf sear seas seba sebe sebs sec- seca secc secd sece secr secs seda sede seds seea seeb seec seed seef seer sees sefa seff sera serb serc serd sere serf serr sers sesa sesc sese sess sfar sfas sfba sfbc sfca sfcc sfcs sfdc sfer sffc sfra sfrc sfss sraf sras srbc srcc srde sreb srec sres srfc srsd ssaa ssab ssac ssas ssbr ssca sscc ssce sscs ssdc ssdd ssdf ssec ssee sses ssfc ssra ssrc ssrs sssa sssb sssc sssf ssss