(motive : Array (Array Lean.Expr × Lean.Expr) × Array Lean.Expr → Sort u_1) →
  (x : Array (Array Lean.Expr × Lean.Expr) × Array Lean.Expr) →
    ((first : Array (Array Lean.Expr × Lean.Expr)) → (rest : Array Lean.Expr) → motive (first, rest)) → motive x