Identify and explain the fallacies of ambiguity that appear in the following passages:

The basis of logic is the syllogism, consisting of a major and a minor premise and a conclusion—thus:
Major Premise: Sixty men can do a piece of work sixty times as quickly as one man; Minor Premise: One man can dig a post-hole in sixty seconds; therefore— Conclusion : Sixty men can dig a post-hole in one second.
This may be called the syllogism arithmetical, in which, by combining logic and mathematics, we obtain a double certainty and are twice blessed.

—Ambrose Bierce, The Devil’s Dictionary , 1911