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def call_twice
puts "Calling your block."
ret1 = yield("very first")
puts "The value of your block: #{ret1}"
puts "Calling your block again."
ret2 = yield("second")
puts "The value of your block: #{ret2}"
end
call_twice do |which_time|
puts "I'm a code block, called for the #{which_time} time."
which_time == "very first" ? 1 : 2
end