The DFAMODE variable holds the initial mode of the DFA.
Normally set to <awk><nul> for processing delimited ascii text like input to
awk (fields separated by space or tab, one record per line). It would
only be necessary to change this when a new pattern matching style has been
defined so that it can be used instead. The example program fragment below sets
the value to <usr><nul> where this would be a user defined pattern.
%%DEFINE DFAMODE <usr><nul>
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