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Patterns 2
Triangular numbers: Pair two triangles to derive the formula.
Fibonacci-type rules: A two-term recurrence needs two starts.
Reasoning 1
Visual patterns: Count what is added and what is shared.
Ambiguous continuation: A rule is more informative than a short list.
Comparing rules: Solve equality to compare two position rules.
Connections
Patterns 2 → Reasoning 1: Rules explain how patterns grow
