Capacity exceeded - input levels

The error

! TeX capacity exceeded, sorry [text input levels=15].

is caused by nesting your input too deeply. You can provoke it with the trivial (Plain TeX) file input.tex, which contains nothing but:

\input input

In the real world, you are unlikely to encounter the error with a modern TeX distribution. TeTeX (used to produce the error message above) allows 15 files open for TeX input at any one time, which is improbably huge for a document generated by real human beings.

However, for those improbable (or machine-generated) situations, some distributions offer the opportunity to adjust the parameter max_in_open in a configuration file.

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