butyl ubtyl btuyl tbuyl utbyl tubyl buytl ubytl byutl ybutl uybtl yubtl btyul tbyul bytul ybtul tybul ytbul utybl tuybl uytbl yutbl tyubl ytubl butly ubtly btuly tbuly utbly tubly bulty ublty bluty lbuty ulbty lubty btluy tbluy bltuy lbtuy tlbuy ltbuy utlby tulby ultby lutby tluby ltuby buylt ubylt byult ybult uyblt yublt bulyt ublyt bluyt lbuyt ulbyt lubyt bylut yblut blyut lbyut ylbut lybut uylbt yulbt ulybt luybt ylubt lyubt btylu tbylu bytlu ybtlu tyblu ytblu btlyu tblyu bltyu lbtyu tlbyu ltbyu byltu ybltu blytu lbytu ylbtu lybtu tylbu ytlbu tlybu ltybu yltbu lytbu utylb tuylb uytlb yutlb tyulb ytulb utlyb tulyb ultyb lutyb tluyb ltuyb uyltb yultb ulytb luytb ylutb lyutb tylub ytlub tlyub ltyub yltub lytub
Note: these 'words' (valid or invalid) are all the permutations of the word butyl. These words are obtained by scrambling the letters in butyl.