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What is this 'weed' please?

It grows to, what appears to be, it's full height of 0.8m in a couple of weeks and is taking over my flower beds. We are fighting a battle with it.
It is easy to weed out but, if we understand what it is then we can develop a plan of attack!
Thin green leaves with a cluster of small pink flowers at the end of each of the multiple stems
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https://www.google.com/search?q=Persicaria+maculosa&client=firefox-b&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiTzIH7rordAhUFY1AKHT6kDNcQ_AUICigB&biw=1920&bih=943