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To run in the GELLO IDE you can use the Run and Debug button which is the plain arrow (sideways triangle) top RHS:on the LHS: 
Then Run the GELLO: 
The result may be viewed top LHS:
Its a good idea to close the session, find the red square which is the stop button: 
. Its easy to have several debug/ run sessions happening at once so keep an eye on that and stop them when desired.
Finally to close, just close the window tab.
