Usually, we want both eyelids to blink together, so it makes sense to only have to animate one, and have the other follow.
(we; want; both eyelids to blink together; T:Usually) (it; makes; sense; to only have to animate one) (it; have; the other follow)
we it it
want makes have
both eyelids to blink together T:Usually
sense to only have to animate one
the other follow