/usr/share/doc/gnat-gps/examples/demo/ is in gnat-gps-doc 6.1.1-1.
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/usr/share/doc/gnat-gps/examples/demo/common/
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/usr/share/doc/gnat-gps/examples/demo/matrix_handling/
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/usr/share/doc/gnat-gps/examples/demo/projects/
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