For example, figures like C and N are open figures, and figures like O and D are closed.
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No, take a semicircle, it is a plane figure and is open. Or a parabola is also open and a plane figure.
"Show" is open, "and" is closed. O- is open, -pen is closed. "Closed" is closed.
Both open syllables.
Both closed.
It is a tessellation