<p><img alt="" class="file-default media-element" src="https://sothik.com/files/styles/responsive_logobreakpoints_theme_bootstrap_screen-md-max_2x/public/4_1.png?itok=6HwHz9QJ">What is the maximum number of 3×3 squares that can be formed from the squares in the 6×6 checker board to the right?</p>
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