Constructs an empty SortedCltn that can hold up to capacity objects. Returns nil if no equal object is found. However, this is not necessarily the index of the first object pointer of a sequence of equal objects. Returns -1 if key is less than all other objects in this SortedCltn , or if this SortedCltn is empty. If no object in this SortedCltn is equal to key , returns the greatest pointer index of an object that is less than key .
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