The singular words "only," and "one," and the initial letter "A" in the word Andrew, are the means by which the facts contained in the above sentence can easily be remembered. A, in Andrew, is the first letter of the alphabet, only (one or first) qualifying president of the United States, one qualifying vote, are the simple means whereby we may remember that Andrew Johnson was the only president of the United States whom it was ever sought to impeach, and that he escaped impeachment by the narrow margin of one vote. The analogous facts that Andrew Johnson was the only president whom it was sought to impeach, and his escaping impeachment by one vote, will enable a person to recall them without trouble, because of their similarity. This being another instance where memory is strengthened by means of
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