law s_hidden_eq
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
import minebender-game@1.0.0.0/LAWS.bend as L
2408law s_hidden_eq:
2409 for +s: T.Seen
2410 {S.is_hidden(s) == L.is_hidden(s) : Bool}