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Rule header condition conflict.
Additional Information
An unconditional 'X' rule has already been entered, so no other 'X'
rules are permitted.
or
Previous 'X' rules have conditions, so the current one requires one as well.
Explanation
Rules such as #IMPLIED element rules, marked-section rules, markup-error rules, etc., can be entered either once with no attached condition, or several times as long as each rule header has a condition.
