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A teacher gave these instructions: “Can you connect all of the dots below using only four straight lines?" She drew the following display on the chalkboard:
Figure 9.1 The teacher gave these instructions: "Can you connect these dots with only four lines
The problem itself and the procedure for solving it seemed very clear: simply experiment with different arrangements of four lines. But two volunteers tried doing it at the board, but were unsuccessful. Several others worked at it at their seats, but also without success.
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