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The drop down boxes provide information
<ol>
  <li>The actions to be taken relative to fluents,
test,assign,increase,decrease,scaleup and scaledown</li>
  <li>The objects that may be reference in this transition</li>
  <li>The dynamic fluents accessible from this transition</li>
</ol>
The designer must enter in the edit box an expression composed from
those elements along with references to static fluents and the numeric
operators +,-,*,/ and the relational operators