'''
pmch.py
Perfect Matchings and RNA Secondary Structures 
http://rosalind.info/problems/pmch/
Defining new terms:
	matching = set of edges in which no node belongs to more than one edge in this set
	perfect matching = true if the matching has n number of nodes where graph has 2n nodes (max # possible)
	complete graph = all nodes are connected to each other
	
'''
