rebuy erbuy rbeuy breuy ebruy beruy reuby eruby rueby ureby eurby uerby rbuey bruey rubey urbey burey ubrey ebury beury eubry uebry buery ubery rebyu erbyu rbeyu breyu ebryu beryu reybu erybu ryebu yrebu eyrbu yerbu rbyeu bryeu rybeu yrbeu byreu ybreu ebyru beyru eybru yebru byeru yberu reuyb eruyb rueyb ureyb euryb ueryb reyub eryub ryeub yreub eyrub yerub ruyeb uryeb ryueb yrueb uyreb yureb euyrb ueyrb eyurb yeurb uyerb yuerb rbuye bruye rubye urbye burye ubrye rbyue bryue rybue yrbue byrue ybrue ruybe urybe ryube yrube uyrbe yurbe buyre ubyre byure ybure uybre yubre ebuyr beuyr eubyr uebyr bueyr ubeyr ebyur beyur eybur yebur byeur ybeur euybr ueybr eyubr yeubr uyebr yuebr buyer ubyer byuer ybuer uyber yuber
Note: these 'words' (valid or invalid) are all the permutations of the word rebuy. These words are obtained by scrambling the letters in rebuy.