based on the database schema:

    Movies(movieTitle, year, length, genre,studioName,producerCertificateNum)

StarsIn(movieTitle,movieYear,starName)

MovieStar(starName, address, gender,birthdate)

MovieExecutive(executiveName, address,certificateNum,netWorth)

    Studio(studioName, address,presidentCertificateNum)

1) Use relational algebra to find the stars who played in every movies produced by Gary Kurtz

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