/usr/share/doc/ruby-graphviz/examples/sample65.rb is in ruby-graphviz 1.0.8-2build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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require 'graphviz/dsl'
digraph :G do
world[:label => "World"] << hello[:label => "Hello"]
#world << hello
output :png => "#{$0}.png"
end
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