your indentation is misleading, the cost entries are at different levels.
You're right that it's misleading, for my reply I assumed there were two closing braces missing right before '135-1' and '1069-9', in which case the cost keys would be at the same level, but your interpretation is possible as well.
vaitor15: Please clarify your input data.
Update: The code in the OP did not compile when I replied because there were missing closing braces. It seems that has now been fixed and you are correct about the nesting.