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140-B6-2

3. Fill in the blanks with the correct numbers.

cube(s) is(are) used for the 1st layer.
cube(s) is(are) used for the 2nd layer.
cube(s) is(are) used for the 3rd layer.
So, cubes are used in all.

4. Count the number of stacked cubes.

cubes
   253   254   255   256   257   258   259   260   261   262   263