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Version History:

 1.0 2006-01-16 initial version

 1.1 2006-01-16

 1.2 2006-03-05 reformat with IntelliJ, add Javadoc

 1.3 2008-04-21 display version number of each class file checked.

 1.4 2011-07-30 add support for Java 1.7

 1.5 2014-03-23 add support for Java 11.8

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