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Symbols for Relational Agebra Expressions and Other Symbols Symbols for relation schemas: R, S, T Symbols for relations: R,5,T Symbols for Relational Algebra operators: u,,,0,p,,n,,+,,,,,,x, Symbols for logical connectives: A1,v0/ Symbols for comparison predicates: 1,z1,z1,s2z1= Symbols for set theoretical operations: ,/,5,c,2,7 Other mathematical symbols: i, ,3,, All names (for example, for relations and attributes) should be written in normal font (no italics) to increase readability, All symbols should be surrounded by blanks to increase readigility. Database schema Library (IID, name, foundationYear) Branch(bID, branchName, address, phoneNumber, totalBooks, IID) Book(ISBN, title, publicationYear, aID, pbID) Author (aID, name, birthDate, nationality) Patron(pID, name, address, phoneNumber, libraryCardNumber, fine) Publisher (PbID, name, address, phoneNumber) Genre( gID, name, description) Member(bID, RID) BranchBooks(bID, ISBN) BookGenre (ISBN, gID) BookRent(ISBN, pID, startDate, dueDate, returnStatus) Query Find the names and phone numbers of patrons who have not returned any book they have rented, excluding those who are members of "branchA" (name and unique). The return status in the BookRent relation is false if a book was not returned