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It is used as an ordinary pen. But if a mistake is made, the the colour changes. The mistake is spotted easily and the homework is done without any problems. A lot of tests were carried out with the'clever' pen. The mistakes are really identified by the pen! But the 'clever' pens are not sold in the shops. They can only be purchased in the special department in our office.

Объяснение:

It is used as an ordinary pen. But if a mistake is made, the the colour changes. The mistake is spotted easily and the homework is done without any problems. A lot of tests were carried out with the clever pen. The mistakes are really identified by the pen! But the clever pens are not sold in the shops. They can only be purchased in the special department in our office.