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With checking-its-existence. With checking of its existence. With existence checking. While checking its existence. OK it could be better written.

haha, you are right bro!

The tutorial explains the language in much more detail: https://litexlang.com/doc/Tutorial/Introduction

have is used to ensure the existence of the object you define. For example, you do not want to declare a new object when it is from an empty set!