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To separate 10 dots with 4 lines, you can create a square with 4 dots at the corners and one dot in the center. This arrangement allows each line to intersect with at least 2 dots, effectively separating all 10 dots.
It is not possible. Several (4) straight lines without lifting your pen is possible but 1 line is not.
The only shape that has 4 lines of symmetry is a square.
It has 4 perpendicular lines, or 4 equal sides. However, not all lines are perfectly equal!
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