Hello, chapter 6.23 Bit String Comprehensions in the latest HTML documentation package has a bug in the example code. Original: 1> << << X*2 >> || <<X>> <= << 1,2,3 >> >>. <<2,4,6>> Correct: 1> << << (X*2) >> || <<X>> <= << 1,2,3 >> >>. <<2,4,6>> Regards: Attila