Part of a sub-pattern will never be matched.

Additional Information

The first sub-pattern in an OR group is always true.
    or
The first sub-pattern in an AND group is always false.

Explanation

In the sub-pattern, (WHITE-SPACE* OR a), sub-pattern a will never be consulted, since the first part always is matched, even if only zero times. In the sub-pattern, ((LOOKAHEAD NOT WHITE-SPACE*) b, the lookahead-not part always fails, so OmniMark never attempts to match sub-pattern b.

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