LEAN_INFORMATION
position 661:20
A : Type,
decA : decidable_eq A,
all_of_subcount_eq_tt :
  ∀ {l₁ l₂ : list A},
    subcount l₁ l₂ = tt → (∀ (a : A), list.count a l₁ ≤ list.count a l₂),
a : A,
l₁ l₂ : list A,
h : subcount (a :: l₁) l₂ = tt,
x : A,
ih : ∀ (a : A), list.count a l₁ ≤ list.count a l₂,
i : list.count a (a :: l₁) ≤ list.count a l₂,
this : x = a
⊢ list.count x (a :: l₁) ≤ list.count x l₂
END_LEAN_INFORMATION