A token is a three character sequence enclosed in angle brackets. Any characters can be used and tokens are case sensitive. With the exception of the input text pattern and the equate expressions the other fields can consist only of tokens.
The mode context argument can consist of tokens, the bar character | or the
brackets ( and ). The new mode argument can consist of tokens
only. The token argument can consist of one token only. The input
argument can consist of tokens, characters, and some special characters.
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