This strip pattern is a pm11. There are vertical reflection lines within the pattern occurring both through the center of the semi-ellipse and through the small circles at the bottom of the pattern. There is no horizontal line of reflection because of the small circles and because the ellipse shapes are only semi-ellipses. There is also no half-turn because the shapes in the pattern maintain the same orientation throughout. Ergo pm11.
This strip pattern is a pm11. There are vertical reflection lines within the pattern occurring both through the center of the semi-ellipse and through the small circles at the bottom of the pattern. There is no horizontal line of reflection because of the small circles and because the ellipse shapes are only semi-ellipses. There is also no half-turn because the shapes in the pattern maintain the same orientation throughout. Ergo pm11.
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