UserSimulation.Classification.AddTypoError C# (CSharp) Method

        public void AddTypoError(OptChar intended, string entered)
        {
            var key = new Tuple<OptChar, string>(intended, entered);
            int value;
            if (_typo_dict.TryGetValue(key, out value))
            {
                _typo_dict[key] += 1;
            }
            else
            {
                _typo_dict.Add(key, 1);
            }
        }