Q.rb

    require 'csv'

    array_107 = []
    array_108 = []
    results = []

    csv_text_107 = File.read("tmp/107.csv")
    csv = CSV.parse(csv_text_107, headers: false)
    csv.each do |row|
      array_107 << row
    end

    csv_text_108 = File.read("tmp/108.csv")
    csv = CSV.parse(csv_text_108, headers: false)
    csv.each do |row|
      array_108 << row
    end

    array_107.each do |school|
      match = array_108.select { |s| s[1] == school[1] }
      results << school if match.empty?
    end

    CSV.open("tmp/#{Time.now.strftime("%Y-%m-%d-%H-%M-%S")}-results.csv", "wb") do |csv|
      results.each do |result|
        csv << result
      end
    end