"<strong> 1</strong><strong>+ 1</strong>", "<strong>2</strong>" "2 + 2", "4" "3 + 3", "6" "4 + 4", "8" "5 + 5", "10" "6 + 6", "12" "7 + 7", "14" "8 + 8", "16" "9 + 9", "18"
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