You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: Richness.m
    path of file: ./repos/BRAPH-2/braph2/measures
    
    the code of the file until where you have to start completion: classdef Richness < Degree
	%Richness is the graph Richness.
	% It is a subclass of <a href="matlab:help Degree">Degree</a>.
	%
	% The Richness (Richness) of a node is the sum of the edges that connect nodes 
	% of higher degree within a layer.
	%
	% The list of Richness properties is:
	%  <strong>1</strong> <strong>ELCLASS</strong> 	ELCLASS (constant, string) is the class of the Richness.
	%  <strong>2</strong> <strong>NAME</strong> 	NAME (constant, string) is the name of the Richness.
	%  <strong>3</strong> <strong>DESCRIPTION</strong> 	D
    
function subclass_list = getSubclasses()
			%GETSUBCLASSES returns all subclasses of the richness.
			%
			% LIST = Richness.GETSUBCLASSES() returns all subclasses of 'Richness'.
			%
			% Alternative forms to call this method are:
			%  LIST = M.GETSUBCLASSES() returns all subclasses of the richness M.
			%  LIST = Element.GETSUBCLASSES(M) returns all subclasses of 'M'.
			%  LIST = Element.GETSUBCLASSES('Richness') returns all subclasses of 'Richness'.
			%
			% Note that the Element.GETSUBCLASSES(M) and Element.GETSUBCLASSES('Richness')
			%  are less computationally efficient.
			%
			% See also subclasses.
			
			subclass_list = { 'Richness'  'CorePeriphery'  'MultiRC'  'MultiplexCP' }; %CET: Computational Efficiency Trick
		end