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define([car], [$1])
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define(car, $1)
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car(foo, bar, baz) ⇒foo [car(foo, bar, baz)] ⇒car(foo, bar, baz)
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car(#) error→EOF in argument list
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car([#)]
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car([#]) ⇒#
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car(foo, bar) ⇒foo car([foo, bar]) ⇒foo, bar car((foo, bar)) ⇒(foo, bar) car([(foo], [bar)]) ⇒(foo car([], []) ⇒ car([[]], [[]]) ⇒[]
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