Surface Split giving duplicate surfaces?

I have a problem where a surface that I am trying to split using a series of closed curves. For some reason I am getting the individual surface that I am looking for, as well as a surface of all other shapes with only the target shape missing. I am therefore ending up with double the number of surfaces that I want.

I have managed to extract the ones I want using a list item component. However, I would ideally just get the same number of surfaces as I have cutting boundaries. I’m sure there is an easy fix to this…

190720_Duplicate surfaces on surface split_WIP.gh (14.6 KB)
Multiple%20split%20boundaries

Flatten the boundary curve input.

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That was far too simple, thanks! I’ll get there eventually…