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A horizontal line has a slope of 0.
Corrugator Supercilii
A facial muscle located beneath the forehead skin, responsible for drawing the eyebrows together and downward.
Orbicularis Oculi
A facial muscle that encircles the eye socket and is responsible for closing the eyelids.
Orbicularis Oris
A complex of muscles in the lips that encircles the mouth, involved in controlling movements of the mouth and lips.
Frontalis
A facial muscle that lifts the eyebrows and causes wrinkles on the forehead, being part of the occipitofrontalis muscle.
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