Definition: The term "subinsertion" typically refers to a process where an entity or item is inserted between two existing items in a sequence. This can be useful for maintaining order, as it ensures that only one instance of a particular item appears at each position in the sequence. For example, suppose you have a list of books with their titles and authors. You might want to insert "The Great Gatsby" into the middle of the list so that it is read from left to right: ```