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+### Remarks
+
+Bundle install
+ this program depends on `gem chunky_png`
+
+Run it with the following command:
+ bundle exec ruby entry.rb trick.png
+ bundle exec ruby entry.rb [other png file]
+
+I confirmed the following implementations/platforms:
+
+* ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin16]
+* ruby 2.4.0p0 (2016-12-24 revision 57164) [x86_64-darwin16]
+
+### Description
+
+This program is a png image viewer.
+The output is an asciiart of the given png file,
+and it is also a source code of the png viewer itself.