public String getComponent(Variable v) {
		for (String s : components.keySet()) {
			if (components.get(s).contains(v)) return s;
		}
		return null;
	}
public String getComponent ( Variable v ) { for ( String s : components . keySet ( ) ) { if ( components . get ( s ) . contains ( v ) ) return s ; } return null ; }
Get the component of a given {@link Variable}.  A component is a {@link String} labeling of {@link Variable}s.
@param v The {@link Variable} of which to get the component.
@return A {@link String} representing the component of the given {@link Variable}.