/usr/lib/open-axiom/input/sqmatrix.input is in open-axiom-test 1.4.1+svn~2626-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | -- Input generated from SquareMatrixXmpPage
)clear all
)set expose add constructor SquareMatrix
m := squareMatrix [[1,-%i],[%i,4]]
m*m - m
mm := squareMatrix [[m, 1], [1-m, m**2]]
p := (x + m)**2
p::SquareMatrix(2, ?)
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