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  • https://math.libretexts.org/Courses/Teachers_College_Columbia_University/Book%3A_Mathematics_for_Elementary_Teachers_(Manes)/01%3A_Counting/1.01%3A_Dots_and_Boxes
    Whenever there are two dots in single box, they “explode,” disappear, and become one dot in the box to the left. Two dots in that box explode and become one dot in the box to the left. Once again, two...Whenever there are two dots in single box, they “explode,” disappear, and become one dot in the box to the left. Two dots in that box explode and become one dot in the box to the left. Once again, two dots in that box explode and become one dot in the box to the left. After all this, reading from left to right we are left with one dot, followed by zero dots, zero dots, and one final dot. Draw 10 dots in the right-most box and perform the explosions.

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