<image>(1) As shown in diagrams ①, ②, ③, and ④, these are four different planar graphs. Count the number of vertices, edges, and regions each planar graph has, and enter the results in the table below:


(2) Observe the table and infer the relationship between the number of vertices (V), edges (E), and regions (F) of a planar graph.

(3) Given that a certain planar graph has 999 vertices and forms 999 regions, determine the number of edges in this planar graph based on the above relationship.