public CutoffClause(Queue<Token> expression) {
        if (expression.peek()!=null) {
            boolean t = true;
            while (t) {
                t = false;
                if (expression.peek()!=null) {
                    if (expression.peek().token == 3 || expression.peek().token == 10) {
                        expression.remove();
                        t = true;
                    }
                }
            }
            this.expression = expression;
        }
    }