An owner of two cats is trying to decide if it is cheaper to order cat food over the Internet or to buy the food locally. Listed below are the prices (in dollars) quoted for two bags of cat food from various manufacturers. 
Calculate the value of TI and TE.
Definitions:
Tentorium Cerebelli
A structure of the meninges, consisting of a fold of dura mater separating the cerebrum from the cerebellum.
Dural Venous Sinus
Channels found between the layers of the dura mater in the brain, which collect and drain venous blood from the brain back to the heart.
Cerebral Aqueduct
A canal within the brain through which cerebrospinal fluid flows, connecting the third and fourth ventricles.
Lateral Ventricle
One of the two ventricles located in the cerebral hemispheres, part of the brain's ventricular system where cerebrospinal fluid is produced and circulates.
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