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example {m n : ℤ} (h1 : m + 3 ≤ 2 * n - 1) (h2 : n ≤ 5) : m ≤ 6 := by
have h3 := calc
m + 3 ≤ 2 * n - 1 := by gcongr
_ ≤ 2 * 5 - 1 := by gcongr
_ = 9 := by norm_num
clear h1 h2
linarith
doesn't work
https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/paperproof.20discussion/near/397816033
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