**adjacent** if they are connected by an edge.

Coloring a graph refers to assigning colors to its vertices. A graph is said to be **properly colored** if every pair of adjacent vertices receive different colors.

Consider the above graph with 4 vertices and 4 edges. This graph is denoted as $C_{4}$. If you are permitted to use 6 different colors, how many proper coloring does $C_{4}$ have ?

**Note:**

1. Vertices are adjacent if they are joined by an edge (line).

2.The coloring that is in the figure is an example of proper coloring.