30) How do I enlarge TeX? I keep getting `memory capacity exceeded'
    errors.

    Most of the time, a ``memory capacity exceeded'' error can be fixed
    without enlarging TeX.  The most common causes are unmatched braces,
    extra-long lines, and poorly-written macros.  Extra-long lines
    are often introduced when files are transferred incorrectly between
    operating systems.  (The tell-tale sign of an extra-long line error
    is when the complaint is that the `buf_size' has overflowed.)

    If you really need to extend your TeX's capacity, the proper method
    varies depending on your installation.  In the purest form, you
    change the parameters in module 11 (``The following parameters can
    be changed...'')  In less pure forms, you might need to modify a
    change file, or perhaps change some environment variables.  Consult
    the documentation that came with your particular implementation.