This file is indexed.

/usr/share/dune-grid/grids/amc/grid-3-3.amc is in libdune-grid-dev 2.5.1-1.

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

The actual contents of the file can be viewed below.

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DIM:          3 
DIM_OF_WORLD: 3

number of vertices: 8
number of elements: 6

vertex coordinates:
  0.0  0.0  0.0
  1.0  0.0  0.0
  0.0  0.0  1.0
  1.0  0.0  1.0
  1.0  1.0  0.0
  1.0  1.0  1.0
  0.0  1.0  0.0
  0.0  1.0  1.0

element vertices:
  0    5    4    1
  0    5    3    1
  0    5    3    2
  0    5    4    6
  0    5    7    6
  0    5    7    2

element boundaries:
  1    1    0    0
  1    1    0    0 
  1    1    0    0
  1    1    0    0
  1    1    0    0
  1    1    0    0

element neighbours:
 -1   -1    1    3
 -1   -1    0    2
 -1   -1    5    1
 -1   -1    4    0
 -1   -1    3    5
 -1   -1    2    4