Hey , I have learned how to use categorie bitmask and contact bitmask and these things but I found one issue that I seek if someone can solve it if it can be solved  What if I have 50 SpriteKit nodes that each of them has a different categorybitmask and I have a ball if the ball collided with one of those 50 SpriteKit nodes it for example change the color of the the collided SpriteKit to for example blue  To achieve this I know I have to write the category bitmask of the SpriteKit node in contact bitmask of the ball The question is what if if I have 50 SpriteKit nodes how can I or do I have to write all of the 50 SpriteKit nodes in the contact bitmask of the ball I tried using a loop but I didn’t know how to implement it right  And thanks for your help