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-- The semantics ("extension") of a container.
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⟦_⟧ : ∀ {ℓ} → Container ℓ → Set ℓ → Set ℓ
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-- Equality, parametrised on an underlying relation.
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Eq : ∀ {c ℓ} {C : Container c} {X Y : Set c} →
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(X → Y → Set ℓ) → ⟦ C ⟧ X → ⟦ C ⟧ Y → Set (c ⊔ ℓ)
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Eq {C = C} _≈_ (s , f) (s′ , f′) =