using System; using System.Collections.Generic; using System.Linq; namespace DAG { public static class DAG { static void Main(string[] args) { var deps = new List<Tuple<char, char>>(); #if false deps.Add(new Tuple<char, char>('A', 'B')); deps.Add(new Tuple<char, char>('B', 'C')); </char,></char,></tuple<char,>…