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    java.lang.NullPointerException
        at msi.gaml.statements.SetStatement$AssignmentSerializer.serialize(SetStatement.java:64)
        at msi.gaml.statements.LetStatement$LetSerializer.serialize(LetStatement.java:84)
        at msi.gaml.descriptions.SymbolSerializer.serialize(SymbolSerializer.java:278)
        at msi.gaml.descriptions.SymbolDescription.serialize(SymbolDescription.java:199)
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