law closed_blank
import minebender-game@1.0.0.0/proof_inv.bend as ProofInvimport Base
import minebender-game@1.0.0.0/types.bend as T
import minebender-game@1.0.0.0/board.bend as B
291law closed_blank:
292 for +w: Nat
293 for +h: Nat
294 for +layout: T.Grid(Bool)
295 {closed(w, h, layout, B.blank(Bool, w, h, False{})) == True{} : Bool}