使用唔同級別嘅返點時，每句裏便高級嘅返點必須跨越曬成套低級嘅返點（如：下 二 一 上），唔能夠交叉噉用（如：下 二 上 一）又或並列使用（如：二 一 下 上）。
When using different levels of flip points, the high-level rebates in each sentence must cross the set of low-level rebates (e.g., lower two and one upper), and cannot be used intersecting (e.g., lower two and one up) or used in parallel (e.g., two and one up).