Once and again

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once and once more; repeatedly.
- Milton.

See also: Once

References in classic literature ?
A person of imaginative temperament, while passing by the house, would turn, once and again, and peruse it well: its many peaks, consenting together in the clustered chimney; the deep projection over its basement-story; the arched window, imparting a look, if not of grandeur, yet of antique gentility, to the broken portal over which it opened; the luxuriance of gigantic burdocks, near the threshold; he would note all these characteristics, and be conscious of something deeper than he saw.
And there was little Pearl, all this while, holding her mother's hand in both her own, and turning her face upward, while she put these searching questions, once and again, and still a third time.
uf and the Templar, ``who have within these few hours once and again lost saddle and stirrup before the lance of a Saxon.