Exact-numbers-in-this-population-are-unknown-but -- Multiple sentences match

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Exact numbers in this population are unknown, but up to 300 per year have been found arriving in Great Britain in autumn ; given their unobtrusive behaviour, this is probably only a fraction of the total.

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Exact numbers in this population are unknown, but typically several hundred are found arriving in Great Britain each autumn ; given their unobtrusive behaviour, this is probably only a fraction of the total.

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