I remember I read this a while ago . <| sep |> Did you make the same sound Dr . Lecter made in the movie after he said that line ? <| sep |> The point I was trying to make with pointing out that it falls within the definition of rotorcraft was that even if it was not a helicopter it is still closely related in a way that a 747 with a rotorblade would most certainly not be . And , again , you can make an argument that it is a kind of helicopter . <| sep |> Let X be a simply connected toric 4 manifold , i . e . it has a T 2 action . A simply connected 4 fold is classified up to homeomorphism by its intersection form . Now select a discrete subgroup of T 2 really I guess something like Zp or Zp x Zq , call it G , and form the quotient XG . What can we say about this new space ? In general XG will be an orbifold , I guess , and I ' m wondering what we can say about its fundamental group and its intersection form .