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The procedures for deleting elements from a list either accept a predicate or a comparison object for determining which elements are to be removed.
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.
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.