In the foreground is a 40x40 grid with no crossing lines in use

In the background 30x30 with a single crossing line making a 20x30 scrimmage pitch

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Bottom right is a10x10 grid

Back left is a 40x40 with two crossing lines being used installed parallel 

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A 30x30 bundle with a single crossing line used to make a 20x30 scrimmage area