Consider a language which uses the following set of characters:
Small set: { a b c }
Large set: { A B C }
Punctuation set: { x y }
This language must follow the following rules:
1. A punctuation character must end all series.
2. A series can have up to but no more than 4 characters, including punctuation characters.
Does the following series follow all the rules of the language defined above?
axBy
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