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sub interleave {
    # PNAMBIC; I'm just making two arrays using length args
...
    
    # Some magic happens here with @$a and @$b
}

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# These are just demonstrator edge cases
interleave(1, 1);
...
ABBBBABBBBBABBBBBA  # 'B' strings can be swapped around
interleave(7, 4);
ABABABABAAA