Although I did use test data almost identical to yours, any similarity between the code I posted and the code you posted is purely coincidental. It's *supposed* to be different, otherwise why post it? That's the whole point. Please note I was responding to the OP, which did not specify a problem domain. Hats off to you for the additional features and assumptions you added in for free on his behalf *applause* ... This brings us to our regularly scheduled standard disclaimer for today...

Standard Disclaimer For Posted Code:

• without warranty regarding claims to completeness, fitness or reliability
• make no assumptions about the given problem domain, unless explicitly stated in the OP
• are offered as free-of-charge food-for-thought
• may not have anything to do with what a reasonable person might expect, and might even be a total red herring, and worth less than the zero Euros you paid for it
• caveat emptor