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     3  Things that we must still check for in stage 3:

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     6 1) Handling of CONSTANTs:

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     8  1.a) "Any program organization unit attempts to modify the value of a variable that has been declared with the CONSTANT qualifier;"

     9  1.b) From table 16.a "The CONSTANT qualifier shall not be used in the declaration of function block instances as described in 2.5.2.1."

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