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Version History:

 1.0 2011-01-03 initial version.

 1.1 2011-01-06 add sound effects, handle clipboard without final nl.

 1.2 2011-02-07 allow individual balancing, also depth bars.

 1.3 2012-03-23 support if1, if2, ifdef, ifndef, ifb, ifnb, export button

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