can anyone please advice how i read how many falls for a subdivided land from front to back?

in the plan, right corner marked: EX 90.89, FS91.27, FB90.17; left corner marked: FX 89.77, FS90.09, FB89.06. In the back right corner marked as EX88.62, FS89.11, left corner is EX88.35, FS88.26.

please advice what is fall on the entire land and what is the slope on building envelop?

What is meant on EX, FS and FB? really appreciate your help.


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