Glad to help! And yes, writing quick test scripts is one of my personal favorite ways to learn things like this.
Side note: I don't know what the original author's intentions were, but it may be worth considering that any $chapter containing 5, including 15, 50, etc. will all be silently converted to 5.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.