Considering just the sideways diamonds a the wallpaper pattern, the smallest rotation symmetry is 90 degrees and there are horizontal and vertical reflection symmetries none of which intersect at 45 degrees so the crystallographic characterization is p4g.
Considering just the sideways diamonds a the wallpaper pattern, the smallest rotation symmetry is 90 degrees and there are horizontal and vertical reflection symmetries none of which intersect at 45 degrees so the crystallographic characterization is p4g.
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