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Study Use of GeoGebra_Apps_API's Javascript Listeners (Tutorial) RemoveListener and ClickListener

Author:Lew W. S.
This is a tutorial example of how Geogebra App API's Javascript's Event Listeners RemoveListener and ClickListener are registered and used. Click on or delete any of the objects and see the response (Can be predicted in the scripts shown below).
REFERENCE : Scripting_Commands at https://wiki.geogebra.org/en/Scripting_Commands Geogebra Apps API : Event Listeners at https://wiki.geogebra.org/en/Reference:GeoGebra_Apps_API#Event_listeners

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