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Double x double x double, 7 letters
Double, double and double again, 7 letters
Eight times as great, 7 letters
Like an amazing return on an investment, 7 letters
Doubles, doubles, and doubles again, 8 letters
Any of Apu's children, on The Simpsons, 8 letters
Exceedingly rare infant, 8 letters
One of Nadya Suleman's kids, e.g., 8 letters
One with the same birthday as seven siblings, 8 letters
Rare birth occurrence, 8 letters