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9. What’s next?
Can you add 2 + 2?
10. Yes, of course!
On the 2nd parallel diagonal from the PD, start with 8 and add 4 to each subsequent sum.
8 + 4 = 12
12 +4 = 16
16 +4 = 20 …
11. Where did the 8 come from?
PD 9 - PD 1 = 8
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