You are given the following information about items X, Y, and Z. 
The weighted aggregate price index for 2015 is
Definitions:
Dural Sinuses
Channels found within the dura mater of the brain that drain venous blood from the brain and transport it into the internal jugular veins.
Functionally Related Nuclei
Groups of neurons within the brain that are connected by their roles in performing specific tasks or functions.
Cerebrum
The largest part of the brain, responsible for voluntary activities and cognitive functions.
Diencephalon
A part of the brain that includes the thalamus and hypothalamus, involved in sensory and motor signal relay and the regulation of consciousness and sleep.
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