...this means the
		          hash %array looks like this:
		  
		  %array = (
		  	'a' => [ 'a', 'b', 'c', 'd' ],	
		  	'b' => [ 'a', 'b', 'c', 'd' ],	
		  	'c' => [ 'a', 'b', 'c', 'd' ],	
		  	'd' => [ 'a', 'b', 'c', 'd' ],	
		  ) ;