>> (define-language test
>>  (e x (λ x e) (e e))
>>  (x variable-not-otherwise-mentioned)
>>  (A hole
>>     (in-hole (A e) (λ x A))))

Cool, that works! I didnt think to do that with in-hole. Can you
explain how it keeps the number of lambdas and arguments the same
though? I'm cant quite figure out what's going on.

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