using System.Collections.Generic;
Dictionary<string, Dictionary<string, int>> data = new Dictionary<string, Dictionary<string, int>>() {
{ "John", new Dictionary<string, int> { {"height", 182}, {"weight", 74} }},
{ "George", new Dictionary<string, int> { {"height", 174}, {"weight", 64} }},
{ "Jenny", new Dictionary<string, int> { {"height", 162}, {"weight", 54} }},
{ "Archie", new Dictionary<string, int> { {"height", 194}, {"weight", 94} }},
Console.WriteLine("Hello, World");
Console.WriteLine(data["John"]["height"]);