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: MultiplexCl.m
    path of file: ./repos/BRAPH-2/braph2/measures
    
    the code of the file until where you have to start completion: classdef MultiplexCl < MultiplexT
	%MultiplexCl is the graph Multiplex Clustering.
	% It is a subclass of <a href="matlab:help MultiplexT">MultiplexT</a>.
	%
	% The two-Multiplex Clustering coefficient (MultiplexCl) of a node i is the fraction 
	%  of two-multiplex triangles (triangles which use edges from two different 
	%  layers) with a vertex in node i and the number of one-triads centered in i.
	%
	% The list of MultiplexCl properties is:
	%  <strong>1</strong> <strong>ELCLASS</strong> 	ELCLASS (constant, string) is the class of the Multiplex Clus
    
function check_out = existsTag(tag)
			%EXISTSTAG checks whether tag exists in multiplex clustering/error.
			%
			% CHECK = MultiplexCl.EXISTSTAG(TAG) checks whether a property with tag TAG exists.
			%
			% Alternative forms to call this method are:
			%  CHECK = M.EXISTSTAG(TAG) checks whether TAG exists for M.
			%  CHECK = Element.EXISTSTAG(M, TAG) checks whether TAG exists for M.
			%  CHECK = Element.EXISTSTAG(MultiplexCl, TAG) checks whether TAG exists for MultiplexCl.
			%
			% Element.EXISTSTAG(TAG) throws an error if the TAG does NOT exist.
			%  Error id: [BRAPH2:MultiplexCl:WrongInput]
			%
			% Alternative forms to call this method are:
			%  M.EXISTSTAG(TAG) throws error if TAG does NOT exist for M.
			%   Error id: [BRAPH2:MultiplexCl:WrongInput]
			%  Element.EXISTSTAG(M, TAG) throws error if TAG does NOT exist for M.
			%   Error id: [BRAPH2:MultiplexCl:WrongInput]
			%  Element.EXISTSTAG(MultiplexCl, TAG) throws error if TAG does NOT exist for MultiplexCl.
			%   Error id: [BRAPH2:MultiplexCl:WrongInput]
			%
			% Note that the Element.EXISTSTAG(M) and Element.EXISTSTAG('MultiplexCl')
			%  are less computationally efficient.
			%
			% See also getProps, existsTag.
			
			check = any(strcmp(tag, { 'ELCLASS'  'NAME'  'DESCRIPTION'  'TEMPLATE'  'ID'  'LABEL'  'NOTES'  'TOSTRING'  'SHAPE'  'SCOPE'  'PARAMETRICITY'  'COMPATIBLE_GRAPHS'  'G'  'M'  'PFM' })); %CET: Computational Efficiency Trick
			
			if nargout == 1
				check_out = check;
			elseif ~check
				error( ...
					['BRAPH2' ':MultiplexCl:' 'WrongInput'], ...
					['BRAPH2' ':MultiplexCl:' 'WrongInput' '\n' ...
					'The value ' tag ' is not a valid tag for MultiplexCl.'] ...
					)
			end