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import tactic.squeeze
defa := 0defb := 0defc := 0deff : ℕ → ℕ := default
@[simp]lemmak (x) : f x = b := rfl
@[simp]lemmal : f b = c := rfl
-- "Try this" suggestion does not workexample : f (f a) = c := by squeeze_simp
-- `squeeze_simp?` doesn't make a difference either,-- apart from also failing the goal-- BTW, order matters:example : f (f a) = c := by simp only [k,l] -- worksexample : f (f a) = c := by simp only [l,k] -- fails
https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/squeeze_simp.20times.20out/near/201137121
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