yodacaia

um, when we are trying to find effectie duration,
we gotta shock the curve dont we?
we shock it once, we get a new curve, so we construct a new tree, we then colaberate the tree with OAS.
we shock it again, opposite direction, we get a new curve, and a new tree, then we again colaberate the tree with OAS.

I think this is what you are asking right?