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had been ciphering

  • past perfect progressive
    of cipher.
    cipher
    noun
    a secret method of writing or recording data, such as by substituting or adding letters or numbers, using specially formed symbols, or the like; code.

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The first thing Congress did in 1861 was to rescind the resolution of June 1, 1860, under which Mr. Floyd had been ciphering.

From Sketches New and Old, Part 2. by Twain, Mark