shows the node distribution of the top 50% MOFs. The four most frequent node building blocks are N320, N391, N599, and N18 (see Figure Sphere colors are as follows: dark grey for carbon, light grey for hydrogen, red for oxygen, brown for copper, dark blue for nitrogen, and light blue for zinc. Sphere colors are as follows: dark grey for carbon, light grey for hydrogen, red for oxygen, green for fluorine.