using System;
using System.linq;
using System.Collections.Generic;

namespace MyCompiler {

public class DictionaryItem { public string ID { get; set; } public string Name { get; set; } }
public class Rate { public DictionaryItem VendorType { get; set; } public DictionaryItem JobCost { get; set; } }
public class Vendor { public string ID { get; set; } public string Name { get; set; } public List<Rate> Rates { get; set; } }
    
    class Program {
        public static void Main() {
                 var vendorItems = new List<Vendor>
                    {
                        new Vendor
                        {
                            ID="v1", Name="Vendor one",
                            Rates = new List<Rate>
                            {
                                new Rate { VendorType = new DictionaryItem{ ID="fuel", Name="Fuel"}, JobCost = new DictionaryItem{ ID="S1", Name="Jet A1"} },
                                 new Rate { VendorType = new DictionaryItem{ ID="FUEL", Name="Fuel"}, JobCost = new DictionaryItem{ ID="S1", Name="Jet A1"} }, // duplicate by case
                                 new Rate { VendorType = new DictionaryItem{ ID="handling", Name="Handling"}, JobCost = new DictionaryItem{ ID="S2", Name="Ramp"} }
                            }
                        },
                        new Vendor
                        {
                            ID = "v2", Name = "Vendor Two",
                            Rates = new List<Rate>
                            {
                                new Rate { VendorType = new DictionaryItem{ ID="Fuel", Name="Fuel"}, JobCost = new DictionaryItem{ ID="S3", Name="Avgas"} }
                            }
                        }
                    }

            var  flattenedRates = vendorItems
            .SelectMany
            
            
        }
    }
}