BuildingsIterator.Filters.ChainFilterBySameFrequency.IsValid C# (CSharp) Метод

        public bool IsValid(string building)
        {
            var chain = new Chain(building);
            var countCalculator = new ElementsCount();

            var firstCount = (int)countCalculator.Calculate(chain.CongenericChain(0), Link.Start);
            for (int i = 1; i < chain.Alphabet.Cardinality; i++)
            {
                if (firstCount != (int)countCalculator.Calculate(chain.CongenericChain(i), Link.Start))
                {
                    return false;
                }
            }

            return true;
        }