Find the product and simplify. 
Definitions:
Eardrum
A thin membrane that separates the outer ear from the middle ear and vibrates in response to sound waves, contributing to the sense of hearing.
Oval Window
A membrane-covered opening that leads from the middle ear to the cochlea in the inner ear, vital for the process of hearing.
Ossicles
The three small bones located in the middle ear, named the malleus, incus, and stapes, that play a key role in transmitting sound vibrations to the inner ear.
Middle Ear
The portion of the ear containing the ossicles, which connect the eardrum to the oval window and amplify sound waves.
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