You cannot give something to someone which already belongs to that person

This reminds me of a joke I heard not too long ago on SF IMC.

As you know, Israel exists on 78% of what was formerly 100% Palestine and Palestinians are on 22% of their original lands (the Occupied Territories). Of that 22%, Israel controls around 42% in the Occupied Territories through settlements. Barak, it is said, offered Palestinians 80% of that 22% of the Occupied Territories in his so called "Generous offer."

As the joke goes:
Rabin to Palestinians (Oslo):
We will give you 100% of 42% of 22% of 100% of what used to be yours.

Barak to Palestinians:
We will give you 80% of 100% of 42% of 22% of 100% of what used to be yours.

Sharon to Palestinians:
We will give you 0% of 80% of 100% of 42% of 22% of 100% of what used to be yours.

This is how ridiculously skewed this conflict has gotten.