LSA is patented technology (US Patent 4,839, 853). The patent is presumably expired. Latent classes were introduced in 50th when statisticians noticed that in poll forms some answers can be successfully predicted. For example, when someone provides positive answers on

LSAtest
.......\LSAtest
.......\LSAtest.sln
.......\LSAtest.suo
.......\.......\bin
.......\.......\...\Debug
.......\.......\...\.....\LSAtest.vshost.exe
.......\.......\...\.....\LSAtest.vshost.exe.manifest
.......\.......\...\Release
.......\.......\EverGrowingDictionary.cs
.......\.......\LSAtest.csproj
.......\.......\obj
.......\.......\...\x86
.......\.......\...\...\Debug
.......\.......\...\...\.....\TempPE
.......\.......\...\...\Release
.......\.......\...\...\.......\TempPE
.......\.......\Program.cs
.......\.......\Properties
.......\.......\..........\AssemblyInfo.cs
.......\.......\selfTestSVD.cs
.......\.......\snowball
.......\.......\........\Among.cs
.......\.......\........\EnglishStemmer.cs
.......\.......\........\SnowballProgram.cs
.......\.......\StopWordFilter.cs
.......\.......\SVD.cs

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