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What does the '-r' mean at the of a variable in Unity Pro?

The Unity Pro Converter adds an '-r' to the end of variables names when the variable is used in
both IEC and LL984 sections.
This variable is only displayed in the LL984 sections.  The original variable name is displayed in the IEC sections.

Unity Pro limits variable names to 32 characters.   If the original variable name is 31 or 32 characters, the last
character(s) is replaced by a '-r'.
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