If 4+4=20, 5+5=30 6+6=42, 7+7=56, then 9+9=?

If 4+4=20, 5+5=30 6+6=42, 7+7=56, then 9+9=?

If 4+4=20,

5+5=30

6+6=42, 

7+7=56,

then 9+9=?

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