law part_true_sum
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/proof_sums.bend as PU
94law part_true_sum:
95 for +g: T.Grid(Maybe<&2, Bool>)
96 {S.part_true(g) == PU.gsum(~Maybe<&2, Bool>, ~tf, g) : Nat}