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        IEnumerable<int[]> IterateWithReverse(int lower = 0, int upper = 10, int depth = 10, int[] slots = null)
        {
            if (slots == null) slots = new int[depth];

            for (int i = lower; i < upper; i++)
            {
                slots[depth - 1] = i;
                if (depth > 1)
                    foreach (var x in IterateWithReverse(lower, upper, depth - 1, slots)) yield return x;
                else

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using System;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using System.Diagnostics;

namespace TopCoderBarclays
{
    [TestClass]
    public class UnitTest1
    {
        [TestMethod]

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using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace LambdaExpressionTraining
{

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We couldn’t find that file to show.

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GenericTypeCollection
{
    class Car

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db.persons.insert( { fname : "John" , lname : "Doe", gender : "M" })

db.persons.insert( 
[
    { fname : "Jane" , lname : "Doe", gender : "F" },
    { fname : "James" , lname : "Bond", gender : "M", Age : 31 },
    { fname : "Jack" , lname : "Daniel", Age : 24 },
])

db.persons.find ( 

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using Microsoft.VisualStudio.TestTools.UnitTesting;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Calculator
{
    public class Position
    {
        public string Trader { get; set; }

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/* 
references:
- https://dev.mysql.com/doc/refman/5.7/en/insert-on-duplicate.html
- https://stackoverflow.com/questions/32777081/bulk-insert-and-update-in-mysql
- https://thewebfellas.com/blog/conditional-duplicate-key-updates-with-mysql
*/

/* create a new database and use it */
drop database if exists test_upsert;
create database test_upsert;