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define(`foo', `Expansion one.') ⇒ foo ⇒Expansion one. pushdef(`foo', `Expansion two.') ⇒ foo ⇒Expansion two. popdef(`foo') ⇒ foo ⇒Expansion one. popdef(`foo') ⇒ foo ⇒foo
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define(`foo', `Expansion one.') ⇒ foo ⇒Expansion one. pushdef(`foo', `Expansion two.') ⇒ foo ⇒Expansion two. define(`foo', `Second expansion two.') ⇒ foo ⇒Second expansion two. undefine(`foo') ⇒ foo ⇒foo
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