+ (set! key k)
+ (display k) (newline))
+ (format #t "~a~%~a~%~%" entities components)
+
+ (receive (e c k) (new-entity `(,(make-a 10 20)) entities components)
+ (set! entities e)
+ (set! components c)
+ (display k) (newline))
+ (format #t "~a~%~a~%~%" entities components)
+
+ (receive (e c) (remove-entity key entities components)
+ (set! entities e)
+ (set! components c))
+ (format #t "~a~%~a~%~%" entities components)
+))