{"task":"Count books on each shelf. Report every shelf count, without sorting or selecting a winner.","node_hint":"Use Summarize. Count book and split by shelf.","rows":[{"book":"Lanterns","shelf":"travel"},{"book":"Fern Notes","shelf":"nature"},{"book":"Blue Kite","shelf":"fiction"},{"book":"Island Paths","shelf":"travel"},{"book":"Cloud Almanac","shelf":"nature"},{"book":"Little Orchard","shelf":"nature"}],"check_yourself":{"counts":[{"shelf":"fiction","count":1},{"shelf":"nature","count":3},{"shelf":"travel","count":2}]},"practice":true,"lesson":"group"}