m1 <- matrix(1:60, 20, 3)
dimnames(m1) <- dimnames(student_results)
m2 <- matrix(101:160, 20, 3)
dimnames(m2) <- dimnames(student_results)
ms <- add_matrix(student_results, m1=m1, m2=m2)
ms2 <- add_matrix(student_results, list(m1=m1, m2=m2))
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