Interior decoration

This task is about constructing a tree diagram.
illustration: floor, walls and ceiling in a lounge
Mr Harding is choosing colours for the walls, carpet, and ceiling of the lounge.
Below are the colours he is choosing from.

Walls:      Yellow (Y), Green (G), or Pink (P)
Carpets:   Blue (B) or Red (R)
Ceiling:     White (W) or Cream (C)
 
Draw a tree diagram below that shows all the possible colour combinations for the walls, carpet, and ceiling Mr Harding is choosing from.