Step 3: Verify none of those keys are public.
Randomly selecting border points or using simple geometric divisions (squares/hexagons) results in too many border points per cluster (50-80). This leads to a shortcut explosion (N*(N-1)/2 shortcuts), making the files large and and calculations slow.
，更多细节参见夫子
沿太行高速：八里沟站-宝泉站；
Sunken Thames barges create new island for birds