law covered_extract
import minebender-game@1.0.0.0/proof_solver.bend as ProofSolverimport Base
import minebender-game@1.0.0.0/types.bend as T
import minebender-game@1.0.0.0/solver.bend as S
2200law covered_extract:
2201 for +ctx: S.Ctx
2202 for +ls: List<&2, T.Grid(Bool)>
2203 for +c: T.Pos
2204 for cov: {S.covered(ls, c) == True{} : Bool}
2205 for +val: {all_valid(ctx, ls) == True{} : Bool}
2206 Witness(ctx, c)