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This prefix is prepended to failed nodes when copying explanations to plain text or HTML.

When on, a failed predicate with several rules shows an intermediate node per rule (navigable to that rule), with each rule's failed sub-goals beneath it. Slower; off by default.

When on (the default), a sub-explanation that occurs several times in a success or failure explanation is shown once and tagged with its count. Turn off to see every occurrence in full (larger trees).

When on, the important reason for a failed query lists all of the deepest failed conditions ("it is not the case that X, nor that Y, nor that Z"), truncated after the third, instead of just the first.