Number on the Bottom

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?




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[W 05 NWO]
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[O 05 EBM]
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Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.