I am very much indebted to you, Dr. Mortimer, for introducing me to a problem which presents several interesting alternatives.
You will observe, Watson, the alternative use of the long s and the short.
I knew that seclusion and solitude were very necessary for my friend in those hours of intense mental concentration during which he weighed every particle of evidence, constructed alternative theories, balanced one against the other, and made up his mind as to which points were essential and which immaterial.
There seemed to be no alternative but to catch him red-handed, and to do so we had to use Sir Henry, alone and apparently unprotected, as a bait.
There are no more uses of "alternative" identified with this meaning in the book.
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Let’s think of at least three alternatives before we decide what to do.