I am trying to execute the Sudoku Solver listed in the book "The Ruby
Programming Book" (pages 17 -24)

The code for the Sudoku Module is available online but I do not
understand the following instruction:

require 'sudoku'
puts Sudoku.solver(Sudoku::Puzzle.new(ARGF.readlines))

Can someone walk me through (baby-steps) how to actually "require"
sudoku so that I can see the Module in action. The more explicit your
answer the better since I am a newbee's newbee!

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