Patio leisure mahjong setCultural‑embassy‑hosted‑public‑events‑within‑Washington‑D.C.‑occasionally‑include‑mahjong‑demonstration‑sessions‑designed‑to‑introduce‑visitors‑to‑the‑deep‑cultural‑heritage‑and‑historical‑background‑of‑this‑world‑famous‑traditional‑tile‑game‑pastime.