And we have on the third carbon, we have so three methyl decay. All right, so let's look at the final example. So here we can start from either this position, this position, this guy, this guy, or this guy. So if we start from this position, we have 1234-561-2345 or 123456, or we can have 123-4567. So if we start from this end or this end, it looks like we get the longest possible carbon backbone. So let's begin from this end.