AIMA.Core.Logic.Propositional.Algorithms.PLResolution.getCombinationPairs C# (CSharp) Method

        private List<List<Sentence>> getCombinationPairs(List<Sentence> clausesList)
        {
            int odd = clausesList.Count % 2;
            int midpoint = 0;
            if (odd == 1)
            {
                midpoint = (clausesList.Count / 2) + 1;
            }
            else
            {
                midpoint = (clausesList.Count / 2);
            }

            List<List<Sentence>> pairs = new List<List<Sentence>>();
            for (int i = 0; i < clausesList.Count; i++)
            {
                for (int j = i; j < clausesList.Count; j++)
                {
                    List<Sentence> pair = new List<Sentence>();
                    Sentence first = clausesList[i];
                    Sentence second = clausesList[j];

                    if (!(first.Equals(second)))
                    {
                        pair.Add(first);
                        pair.Add(second);
                        pairs.Add(pair);
                    }
                }
            }
            return pairs;
        }