How, when reading from a file of an array of strings, to discard and ignore one of the occurrences?

Question

C++ / C#

Hello everyone, I'm confused and can't solve the following:
there is a text file that contains the lines:

one two three ten lot soap test
five good lot test bread seven one
...

that is, the size of the array is the same in the line - 7, but in the future I need to discard only one word, and how to forget that I have a size of 7.
For example, the word "many", in the first line it has the index [4] and in the second line [2] - I need to ignore this word and assume that there is another word at this index, in the first line "soap", and in the second line "test". That is - do not remove all occurrences, but simply ignore it.

Answer 1

var line = reader.ReadLine();
var words = line.Split(" ".ToCharArray()).ToList();
words.RemoveAt(4);
var result = string.Join(" ", words);

Answer 2

If you are reading the file line by line and want each word to be unique? then why not look towards collections. I think Set will do here about Collections C#

Answer 3

static void Main()
    {
        string[] lines = System.IO.File.ReadAllLines(@"e:\temp\test.txt");
        List<string> result = new List<string>();
        foreach (string line in lines)
        {
            string[] split = line.Split(new Char[] { ' ' });
            foreach (string spl in split)
            {
                result.Add(spl);
                result.Remove("много");
            }
            foreach (string res in result)
            {
                Console.WriteLine(res + " - " + result.Count);
            }
        }
        Console.WriteLine("Press any key to exit.");
        System.Console.ReadKey();
    }

now I have all the contents of the test.txt file listed! and I need to enter only the contents of one line so that the dimension of the list is one less than the original line