using System;
using System.Collections.Generic;

public class Allergies
{
    public Allergies(int mask)
    {
    }

    public bool IsAllergicTo(string allergy)
    {
        throw new NotImplementedException("You need to implement this function.");
    }

    public IList<string> List()
    {
        throw new NotImplementedException("You need to implement this function.");
    }
}