[racket] Key-event test problem

Hello all,
We're students and we're working on a space invaders project.

Our game runs very well but we've got a problem:
We would like to give the opportunity to players to press two keyboards buttons at the same time but for now,our program tests only one event at the same time.
Is there a solution for that ?

Thanks all.

Laurine and Vincent

 		 	   		  
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