Assertion: mackerel | /r/CapableOf | increase in number
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Source sentences:
text: Mackerel then increased again in numbers; slowly at first, then more rapidly, as appears from the fact that the catch for the Gulf of Maine and for the banks at its mouth was about four times as great in 1911 (about 2½ million pounds) as it had been the year before, rising to about 41/3 million pounds in 1912, 5 million in 1913,