[Rails] (koans) another problem (syntax error)

Hello,

I now trying to solve this one :

# Triangle Project Code.

# Triangle analyzes the lengths of the sides of a triangle
# (represented by a, b and c) and returns the type of triangle.
#
# It returns:
#   :equilateral  if all sides are equal
#   :isosceles    if exactly 2 sides are equal
#   :scalene      if no sides are equal
#
# The tests for this method can be found in
#   about_triangle_project.rb
# and
#   about_triangle_project_2.rb
#
def triangle(a, b, c)
  if ((a == b) and (b == c)) 
     return :equilateral
  if (((a == b) and (b != c)) or ((a != b) and (b == c)))
     return :isosceles
  if ((a !=b) and (b != c))
     return :scalene
end

But I see this error message :

/about_triangle_project.rb:4:in `require': ./triangle.rb:27: syntax error, unexpected $end, expecting kEND (SyntaxError)
    from ./about_triangle_project.rb:4
    from path_to_enlightenment.rb:18:in `require'
    from path_to_enlightenment.rb:18


Can anyone give me a tip what I have done wrong ?

Roelof

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