private void add_to_wait(string word, int row, int colum)
{
if (!wait_to_check.Contains(word))
wait_to_check.Add(word);
if (!wait_list.ContainsKey(word))
{
wait_list.Add(word, new List<row_colum>());
}
List<row_colum> l = wait_list[word];
l.Add(new row_colum(row, colum));
}