Get all unique variations

Here is class I have:

public class Schedule
{
    public string mintime { get; set; }
    public string maxtime { get; set; }
    public string weekday { get; set; }
}

I got a list of such schedule with repeat week days like

List<Schedule> list = new List<Schedule> {
    new Schedule { mintime = "01.01.2012", maxtime = "05.01.2012", weekday = "1" },
    new Schedule { mintime = "05.01.2012", maxtime = "10.01.2012", weekday = "1" },
    new Schedule { mintime = "10.01.2012", maxtime = "20.01.2012", weekday = "2" },
    new Schedule { mintime = "01.02.2012", maxtime = "10.02.2012", weekday = "2" },
    new Schedule { mintime = "01.03.2012", maxtime = "10.03.2012", weekday = "3" },
    new Schedule { mintime = "01.04.2012", maxtime = "10.04.2012", weekday = "4" }
};

How can I get List> with all combinations like:

List<List<Schedule>> list = new List<List<Schedule>> {
    new List<Schedule> { 
        new Schedule { mintime = "01.01.2012", maxtime = "05.01.2012", weekday = "1" },
        new Schedule { mintime = "10.01.2012", maxtime = "20.01.2012", weekday = "2" }, 
        new Schedule { mintime = "01.03.2012", maxtime = "10.03.2012", weekday = "3" },
        new Schedule { mintime = "01.04.2012", maxtime = "10.04.2012", weekday = "4" }
    },
    new List<Schedule> { 
        new Schedule { mintime = "01.01.2012", maxtime = "05.01.2012", weekday = "1" },
        new Schedule { mintime = "01.02.2012", maxtime = "10.02.2012", weekday = "2" },
        new Schedule { mintime = "01.03.2012", maxtime = "10.03.2012", weekday = "3" },
        new Schedule { mintime = "01.04.2012", maxtime = "10.04.2012", weekday = "4" }
    },
    new List<Schedule> { 
        new Schedule { mintime = "05.01.2012", maxtime = "10.01.2012", weekday = "1" },
        new Schedule { mintime = "10.01.2012", maxtime = "20.01.2012", weekday = "2" },
        new Schedule { mintime = "01.03.2012", maxtime = "10.03.2012", weekday = "3" },
        new Schedule { mintime = "01.04.2012", maxtime = "10.04.2012", weekday = "4" }
    },
    new List<Schedule> { 
        new Schedule { mintime = "05.01.2012", maxtime = "10.01.2012", weekday = "1" },
        new Schedule { mintime = "01.02.2012", maxtime = "10.02.2012", weekday = "2" },
        new Schedule { mintime = "01.03.2012", maxtime = "10.03.2012", weekday = "3" },
        new Schedule { mintime = "01.04.2012", maxtime = "10.04.2012", weekday = "4" }
    },
};

?

Is it possible to get it using LINQ?

---

The main topic of my question is to build list of schedules. Each schedule should include monday, tuesday, wednesday, thursday, friday, saturday and sunday once. And I need to build such list using a more common list that contains a many schedules for mondays, wednesdays and so on.

---

Using Eric Lippert 's CartesianProduct here

List<List<Schedule>> newList = CartesianProduct(list.GroupBy(l => l.weekday))
                               .Select(x => x.ToList())
                               .ToList();

--

public static IEnumerable<IEnumerable<T>> CartesianProduct<T>(IEnumerable<IEnumerable<T>> sequences)
{
    IEnumerable<IEnumerable<T>> emptyProduct = new[] { Enumerable.Empty<T>() };
    return sequences.Aggregate(
        emptyProduct,
        (accumulator, sequence) =>
        from accseq in accumulator
        from item in sequence
        select accseq.Concat(new[] { item }));
}

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