class AttendanceClock : Dictionary<Day, List<WorkSession>>

enum Day
{
    Sunday = 1,
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday
}

public class WorkSession : IEquatable<WorkSession>
{
    public Time Entrance { get; private set; }
    public Time Exit { get; private set; }

    public WorkSession(Time entrance, Time exit)
    {
        Entrance = entrance;
        Exit = exit;
    }

    public override bool Equals(object obj)
    {
        return Equals(obj as WorkSession);
    }
    public bool Equals(WorkSession other)
    {
        return other != null
               && Entrance == other.Entrance
               && Exit == other.Exit;
    }

    public override int GetHashCode()
    {
        var hashCode = 1257807568;
        hashCode = hashCode * -1521134295 + EqualityComparer<Time>.Default.GetHashCode(Entrance);
        hashCode = hashCode * -1521134295 + EqualityComparer<Time>.Default.GetHashCode(Exit);
        return hashCode;
    }
}

class AttendanceClock : Dictionary<Day, List<WorkSession>>, IEquatable<AttendanceClock>
{
    public bool Equals(AttendanceClock other)
    {
        foreach(KeyValuePair<Day, List<WorkSession>> keyValuePair in this)
        {
            Day day = keyValuePair.Key;
            List<WorkSession> workSessions = keyValuePair.Value;

            if(other.TryGetValue(day, out var otherWorkSessions))
            {
                // ScrambledEquals is a helper method that compares
                // two IEnumerables by value  regardless of the items
                // order, so {1, 2} is equal to {2, 1}
                if(!Helpers.ScrambledEquals(workSessions, otherWorkSessions))
                {
                    return false;
                }
            }
        }

        return true;
    }
}