This file is indexed.

/usr/lib/mumps/input_simpletest_real is in mumps-test 5.1.2-4.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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5              :N
12             :NZ
1 2 3.0
2 3 -3.0
4 3 2.0
5 5 1.0
2 1 3.0
1 1 2.0
5 2 4.0
3 4 2.0
2 5 6.0
3 2 -1.0
1 3 4.0
3 3 1.0        :values
20.0
24.0
9.0
6.0
13.0           :RHS