Your code looks like it has just been cobbled together with snippets from various sources. This is OK, but don't be afraid to make changes and experiment with the code to see what happens.

I personally believe it's far from being OK unless one

• understands what that those snippets do, or tries to and upon failure asks for clarification, or
• can safely take a black-box approach: e.g. I can't understand a given sub's algorithm, but I have a clear idea of what input it takes and what output does it spit out. (Or try to understand that and upon failure...)

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