i1 : apropos "atrix"
o1 = {BlockMatrix, ChangeMatrix, CompactMatrix, compactMatrixForm,
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diagonalMatrix, fillMatrix, genericMatrix, genericSkewMatrix,
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genericSymmetricMatrix, getChangeMatrix, Matrix, matrix,
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MatrixExpression, MinimalMatrix, MutableMatrix, mutableMatrix,
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randomMutableMatrix, submatrix, submatrix', submatrixByDegrees,
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sylvesterMatrix, SyzygyMatrix}
o1 : List
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