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/usr/share/dune-grid/grids/dgf/test2ug.dgf 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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 DGF
 VERTEX
 firstindex 1
 0.0000000000 0.0000000000
 0.2500000000 0.0000000000
 0.5000000000 0.0000000000
 0.7500000000 0.0000000000
 1.0000000000 0.0000000000
 0.0000000000 0.2500000000
 0.2500000000 0.2500000000
 0.5000000000 0.2500000000
 0.7500000000 0.2500000000
 1.0000000000 0.2500000000
 0.0000000000 0.5000000000
 0.2500000000 0.5000000000
 0.5000000000 0.5000000000
 0.7500000000 0.5000000000
 1.0000000000 0.5000000000
 0.0000000000 0.7500000000
 0.2500000000 0.7500000000
 0.5000000000 0.7500000000
 0.7500000000 0.7500000000
 1.0000000000 0.7500000000
 0.0000000000 1.0000000000
 0.2500000000 1.0000000000
 0.5000000000 1.0000000000
 0.7500000000 1.0000000000
 1.0000000000 1.0000000000
 #
 CUBE
 map 0 1 3 2 4 5 7 6
 1 2 7 6
 2 3 8 7
 3 4 9 8
 4 5 10 9
 6 7 12 11
 7 8 13 12
 8 9 14 13
 9 10 15 14
 11 12 17 16
 12 13 18 17
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 #
 BOUNDARYDOMAIN
 default 1
 #