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         DDJ 2.4
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+ Allows to debug programs without having generated their whole ET. 
+ Corrects some detected small bugs in the source code. 
+ Allows the debugger to automatically balance the ET.
+ Allows to project and collapse nodes of the ET .
+ The strategies for algorithmic debugging have been adapted to work with projected and collapsed nodes. 
+ The GUI is able to ask complex questions of projected/collapsed nodes.