System.Security.Util.StringExpressionSet.Reduce C# (CSharp) Method

        protected void Reduce()
        {
            CheckList();
            
            if (this.m_list == null)
                return;
            
            int j;

            for (int i = 0; i < this.m_list.Count - 1; i++)
            {
                j = i + 1;
                
                while (j < this.m_list.Count)
                {
                    if (StringSubsetString( (String)this.m_list[j], (String)this.m_list[i], m_ignoreCase ))
                    {
                        this.m_list.RemoveAt( j );
                    }
                    else if (StringSubsetString( (String)this.m_list[i], (String)this.m_list[j], m_ignoreCase ))
                    {
                        // write the value at j into position i, delete the value at position j and keep going.
                        this.m_list[i] = this.m_list[j];
                        this.m_list.RemoveAt( j );
                        j = i + 1;
                    }
                    else
                    {
                        j++;
                    }
                }
            }
        }

        [System.Security.SecurityCritical]  // auto-generated
        public StringExpressionSet Union(StringExpressionSet ses)
        {
            // If either set is empty, the union represents a copy of the other.

            if (ses == null || ses.IsEmpty())
            {
                return(this.Copy());
            }

            if (this.IsEmpty())
            {
                return(ses.Copy());
            }

            CheckList();
            ses.CheckList();

            // Perform the union
            // note: insert smaller set into bigger set to reduce needed comparisons

            StringExpressionSet bigger  = ses.m_list.Count > this.m_list.Count ? ses : this;
            StringExpressionSet smaller = ses.m_list.Count <= this.m_list.Count ? ses : this;

            StringExpressionSet unionSet = bigger.Copy();

            unionSet.Reduce();

            for (int index = 0; index < smaller.m_list.Count; ++index)
            {
                unionSet.AddSingleExpressionNoDuplicates((String)smaller.m_list[index]);
            }

            unionSet.GenerateString();

            return(unionSet);
        }