I identified 2 collections. Their names are numbers1 and numbers2. I identified another collection called common. After, I added number1 and number2 to common collection. The problem is that I delete item 4 in collection called common but I also want to delete item 4 in collection called numbers. According to codes on image 4 is deleted only from common collection. How can I fix that problem? Is there any short way to make this? I can fix that using if else but it last too long. I hope you understand my problem. Sorry for my English.
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