File list:
CombinatoricsSample
..................\TextSumProblemSample
..................\....................\bin
..................\....................\...\Debug
..................\....................\...\Release
..................\....................\Combinatorics
..................\....................\.............\Combinations.cs
..................\....................\.............\GenerateOption.cs
..................\....................\.............\IMetaCollection.cs
..................\....................\.............\Permutations.cs
..................\....................\.............\SmallPrimeUtility.cs
..................\....................\.............\Variations.cs
..................\....................\obj
..................\....................\...\Debug
..................\....................\...\.....\Refactor
..................\....................\...\.....\TempPE
..................\....................\...\Release
..................\....................\...\.......\TempPE
..................\....................\Properties
..................\....................\..........\AssemblyInfo.cs
..................\....................\..........\Resources.Designer.cs
..................\....................\..........\Resources.resx
..................\....................\..........\Settings.Designer.cs
..................\....................\..........\Settings.settings
..................\....................\Facet.ico
..................\....................\Program.cs
..................\....................\TextSumForm.cs
..................\....................\TextSumForm.Designer.cs
..................\....................\TextSumForm.resx
..................\....................\TextSumProblem.cs
..................\....................\TextSumProblemSample.csproj
..................\....................\TextSumProblemSample.csproj.user
..................\CombinatoricsSample.sln