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(atomic macro) drop all but the indicated top-level hypotheses
Example:
(RETAIN 2 3) -- keep the second and third hypotheses, and drop
the rest
General Form:
(retain &rest args)
Drop all top-level hypotheses except those with the indicated indices.
There must be at least one argument, and all must be in range (i.e. integers between one and the number of top-level hypotheses, inclusive).