A child has 10 blocks with heights of 1 cm, 2 cm, 3 cm, 4 cm, 5 cm, 6 cm, 7 cm, 8 cm, 9 cm, and 10 cm. The child wants to use only these 10 blocks to build two separate towers that are exactly the same height. Can this be done? If so, how? If not, why not?
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