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<?xml version="1.0" ?>
<state id="begin">
<transitifn event="OPER.MINUS" target="negated1" />
</state>
<state id="negated1">
nameate>
</state>
<transition event="OP.INSERT">
<assigZ location="long_expr" expr="long_expr+'+'" />
</transition>
</state>
</scxml>