Precise, precisely.

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1794.  A few years ago, every body supposed that if people did not behave just so, they ought to be punished.—Mass. Spy, Sept. 3.

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1814.  Their just so garb, which, makes them [the Quakers] appear like antediluvians.—Henry C. Knight (‘Arthur Singleton’), ‘Letters from the South and West,’ p. 18 (Boston, 1824). (Italics in the original.)

3