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When the graphics exceeds this width, attempts will
be made to break it and start a continuation line.
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Unless disabled, direct recursion will be replaced by repetition. This
applies to nonterminals, whose directly recursive references are
either left- or right-recursive only. Upon success,
productions are inlined, when a single reference remains.
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When checked, left and right factoring will be applied to
right-hand sides of all productions individually, in order
to achieve more compact diagrams.
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Replace nonterminal references by their definition, when they derive to a single
string literal.
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Keep references to nonterminals, that derive to epsilon only. When unchecked,
they will be removed.
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