Search deques
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A search deque is a data structure with constant-time insertion and removal of elements at both ends, and constant-time membership tests. Inserting an element more than once has no effect. Search deques implement all deque operations in terms of an underlying deque, and membership testing with deque-member? is implemented with an underlying assoc. Search deques are defined in the search-deques vocabulary.

Creating a search deque:
<search-deque> ( assoc deque -- search-deque )