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A condition which consists of a list of alternatives to match at any location
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A condition which consists of a list of alternatives to match at a specific location
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A condition which is true of the values of its two subconditions are true
and both have the same value
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A condition on the presense of a particular kind of composite item (possibly also with a particular content)
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A set of conditions which much match the query in sequence
Returns the condition this is nested within, or null if it is not nested