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39.3.8 Deleting
---------------
The procedures for deleting elements from a list either accept a
predicate or a comparison object for determining which elements are to
be removed.
-- Scheme Procedure: delete x lst [=]
-- Scheme Procedure: delete! x lst [=]
Return a list containing all elements from LST, but without the
elements equal to X. Equality is determined by the equality
predicate =, which defaults to `equal?' if not given.
`delete!' is allowed, but not required to modify the structure of
the argument list in order to produce the result.
-- Scheme Procedure: delete-duplicates lst [=]
-- Scheme Procedure: delete-duplicates! lst [=]
Return a list containing all elements from LST, but without
duplicate elements. Equality of elements is determined by the
equality predicate =, which defaults to `equal?' if not given.
`delete-duplicates!' is allowed, but not required to modify the
structure of the argument list in order to produce the result.
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