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(("1" (expand "nderiv" 1)
(("1"
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(("2" (lemma "ln_derivable")
(("2" (flatten -1)
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(lemma "const_derivable_fun[posreal]"
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(("1" (lemma "deriv_id_fun[posreal]")
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(("1" (expand "I")
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--> --------------------
--> maximum size reached
--> --------------------
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