@Override
	public String getExpression() {
		if(this.state == null) return "B";
		
		String expression = "";
		
		boolean first = true;
		for(VariableToValue v : this.state){
			if(!first){
				expression += ",";
			}
			first = false;
			
			expression += v.getExpression();
		}
		
		return expression;
	}