.OrderBy(s => s.City)
    .ThenBy(s => s.Location)
    .Select(s => new 
    {
        City = s.City,
        Location = s.Location,
        Sales = Orders
            .Where(dateGroup => s.StoreID == dateGroup.StoreID && dateGroup.OrderDate.Month == 12)
            .GroupBy(o => new {o.OrderDate})
            .Select(s => new 
            {
                Sales = s.Key.OrderDate,
                NumberOfOrders = s.Count(),
            })

    })
    .Dump();
    

    .OrderBy(s => s.City)
    .ThenBy(s => s.Location)
    .Select(s => new 
    {
        City = s.City,
        Location = s.Location,
        Sales = Orders
            .Where(dateGroup => s.StoreID == dateGroup.StoreID && dateGroup.OrderDate.Month == 12)
            .GroupBy(o => new {o.OrderDate})
            .Select(s => new 
            {
                Sales = s.Key.OrderDate,
                NumberOfOrders = s.Count(),
            })

    })
    .Dump();