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+{-# OPTIONS --without-K --safe #-}
+
+open import Relation.Binary using (Setoid)
+
+module Cfe.Judgement.Base
+  {c ℓ} (over : Setoid c ℓ)
+  where
+
+open import Cfe.Expression over
+open import Cfe.Type over renaming (_∙_ to _∙ₜ_; _∨_ to _∨ₜ_)
+open import Cfe.Type.Construct.Lift over
+open import Data.Fin
+open import Data.Nat as ℕ hiding (_⊔_)
+open import Data.Vec hiding (_⊛_)
+open import Level hiding (Lift) renaming (suc to lsuc)
+
+infix 2 _,_⊢_∶_
+
+data _,_⊢_∶_ {m} {n} : Vec (Type ℓ ℓ) m → Vec (Type ℓ ℓ) n → Expression (n ℕ.+ m) → Type ℓ ℓ → Set (c ⊔ lsuc ℓ) where
+  Eps : ∀ {Γ Δ} → Γ , Δ ⊢ ε ∶ Lift ℓ ℓ τε
+  Char : ∀ {Γ Δ} c → Γ , Δ ⊢ Char c ∶ Lift ℓ ℓ τ[ c ]
+  Bot : ∀ {Γ Δ} → Γ , Δ ⊢ ⊥ ∶ Lift ℓ ℓ τ⊥
+  Var : ∀ {Γ Δ i} i≥n → Γ , Δ ⊢ Var i ∶ lookup Γ (reduce≥ i i≥n)
+  Fix : ∀ {Γ Δ e τ} → Γ , τ ∷ Δ ⊢ e ∶ τ → Γ , Δ ⊢ μ e ∶ τ
+  Cat : ∀ {Γ Δ e e′ τ τ′} → Γ , Δ ⊢ e ∶ τ → Δ ++ Γ , [] ⊢ e′ ∶ τ′ → τ ⊛ τ′ → Γ , Δ ⊢ e ∙ e′ ∶ τ ∙ₜ τ′
+  Vee : ∀ {Γ Δ e e′ τ τ′} → Γ , Δ ⊢ e ∶ τ → Γ , Δ ⊢ e′ ∶ τ′ → τ # τ′ → Γ , Δ ⊢ e ∨ e′ ∶ τ ∨ₜ τ′