docs: public ConstraintNetwork getMetaVariable() {
  		ConstraintNetwork[] vars = this.getMetaVariables();
  		if (vars != null && vars.length > 0) {
  			if (varOH != null) {
  				varOH.collectData(vars);
  				Arrays.sort(vars, varOH);
  			}
  			return vars[0];
  		}
  		return null;
  	}