The rooms in a house are adjacent as indicated in the following table. An $\text{'}*\text{'}$ means they are adjacent, and a $\text{'}-$'means they are

not.

How few colors can be used so that each room is painted a color so in which no two adjacent rooms are the same color?

List the rooms in groups with the same color, with the groups separated by semicolons $($i$.$e$.$ F E; A; G B D; C$).$