A PQ tree with many P and Q nodes can represent complicated subsets of the set of all possible orderings.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: A PQ tree with many P and Q nodes can represent complicated subsets of the set of all possible orderings. ### Response: .