def item_onb
import minebender-game@1.0.0.0/proof_solver.bend as ProofSolverimport Base
import minebender-game@1.0.0.0/board.bend as B
import minebender-game@1.0.0.0/solver.bend as S
import minebender-game@1.0.0.0/proof_cells.bend as PS
310def item_onb(e: PS.WH, i: S.Item) -> Bool:
311 match e i:
312 case PS.WH{+w, +h} S.Item{p, s, ns}:
313 B.on_board(w, h, p) && PS.allp(~PS.WH, ~PS.onb, PS.WH{w, h}, ns)