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Subjects: MATHEMATICS textbooks; TEACHING aids; SET theory
Subjects: HIGH heel shoes; MATHEMATICS textbooks; TEACHING aidsCABO Verde
Subjects: EIGENVECTORS; LINEAR algebra; EIGENVALUE equations
Subjects: SECONDARY schools; DECISION making; MATHEMATICS education
Subjects: HISTORY of mathematics; MATHEMATICS teachers; TEACHERS
Subjects: HIGH school teachers; MATHEMATICS textbooks; MATHEMATICS teachersPARAIBA (Brazil : State); BRAZIL