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        (F) Probably means you had a syntax error.  Common reasons include
+:

...
        A semicolon is missing.
        A comma is missing.
        An opening or closing parenthesis is missing.
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            A closing quote is missing.

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    perl -c repeatedly, chopping away half the program each time to se
+e
    if the error went away.  Sort of the cybernetic version of S<20
    questions>.