A multivalued map of strings, where keys are NOT case sensitive.
A multivalued map of strings, where each string key refers to zero or more string values. All keys are case-sensitive.
A multi-valued mapping, where a key is mapped to one or more values. The map is sorted by keys for O(log(n)) lookup and retrieval, and O(n*log(n)) insertion.
An implementation of a multi-valued mapping, where one key may map to one or more values.