no-empty


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#!/usr/bin/env ruby

require 'zipf'

files = []
(0..1).each { |i| files << ReadFile.new(ARGV[i]) }
(2..3).each { |i| files << WriteFile.new(ARGV[i]) }

while line_f = files[0].gets
  line_e = files[1].gets
  line_f.strip!; line_e.strip!
  next if line_f=='' || line_e==''
  files[2].write line_f+"\n"
  files[3].write line_e+"\n"
end

files.each { |f| f.close }