Add an evaluation macro 
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To write an evaluation macro:

#. Identify tests and result values:

#. A simple test resolves to True or False.
#. an If-Then-Else test resolves to a value.

#. For a simple test, identify the values and operator to resolve to
   True or False.
#. For an If-Then-Else test, identify If-, Else- and default conditions
   and values.