# 1. Symbol#to_proc
class Symbol
  def to_proc
  end
end

# 2. 6 * 9
class Fixnum
  def *(other)
  end
end

# 3. Object#&
class Object
  def &(*args)
  end
end

# 4. Class#around_method
class Class
  def around_method(name, &code)
  end
end

# 5. Object#swap_methods
class Object
  def swap_methods(method1, method2)
  end
end

# 6. Enumerable#map_hash
module Enumerable
  def map_hash
  end
end

# 7. Proxy
class Proxy
  def initialize(obj)
  end

  # Две малки подсказки:

  def around(name, *args)
  end

  def method_missing(name, *args)
  end
end

# 8. Array#<, Array#>, Array#<=, Array#>=
class Array
end

# 9. Hash#multi_invert
class Hash
  def multi_invert
  end
end

# 10. Object#expose_all
class Object
  def expose_all
  end
end