说明
A square of sidewalk is filled with asphalt while all the surrounding squares are cement. The asphalt is sunken and makes it easy for pedestrians to trip on the edges of the cement and for wheelchairs to get stuck.
A square of sidewalk is filled with asphalt while all the surrounding squares are cement. The asphalt is sunken and makes it easy for pedestrians to trip on the edges of the cement and for wheelchairs to get stuck.
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