Author note — to cover

Find every route satisfying an event, exactly one head, different colours, at least one six, then add the route products; cross-reference the complement shortcut for at-least-one (Combined events). Two-stage trees at Foundation, three-stage leaning Higher. Both tiers. Exclude given-that readings of a tree, which are Higher (Combined events). (P8)

• Fluency — direct questions on adding across the paths, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).