Create a Dictionary of Lists in Unity C#

MakeDictionaryOfLists.cs

using UnityEngine;
using System.Collections.Generic;

public class MakeDictionaryOfLists : MonoBehaviour {
    Dictionary<string, List<int>> table = new Dictionary<string, List<int>>();

    void Start() {
        // Fill our table with Lists containing ints using Arrays to intialize
        // the Lists.
        table["a"] = new List<int>(){1};
        table["b"] = new List<int>(){2};
        table["c"] = new List<int>(){3};

        foreach(string str in table.Keys) {
            // Get the value for our Key.
            List<int> value = table[str];

            // If the Key is the desired Key, append to its list.
            if(str == "c") {
                value.Add(4);
            }

            // print the first item in each of the Lists.
            Debug.Log(value[0]);
        }

        // Print the appended item to see that it worked.
        Debug.Log(table["c"][1]);
    }
}