# def triangle(a, b, c)
  # if a==b or b==c or a==c
    # if a==b and b==c and a==c
	  # :equilateral
	# else
	  # :isosceles
	# end
  # else
    # :scalene
  # end
# end

def triangle(a, b, c)
  case [a, b, c].uniq.size
  when 1
    :equilateral
  when 2
    :isosceles
  when 3
    :scalene
  end
end