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Description
The Puzzler tries to teach Seven and One how to use a pen and why it can't be erased. However, the pen wouldn't work. Puzzler tried everything, but the pen wouldn't budge. Finally he looked at the pen where the ink comes out. Soon ink gets onto his face. One starts to laugh. (You can probably guess why I used green ink instead of black or blue.)

Description
The Puzzler tries to teach Seven and One how to use a pen and why it can't be erased. However, the pen wouldn't work. Puzzler tried everything, but the pen wouldn't budge. Finally he looked at the pen where the ink comes out. Soon ink gets onto his face. One starts to laugh. (You can probably guess why I used green ink instead of black or blue.)