A spinner for a board game has three equally sized sections: an orange section, a purple section, and a green section. If the spinner is flicked twice, there are nine equally likely outcomes (using O for orange, P for purple, and G for green): S = {OO, OP, OG, PO, PP, PG, GO, GP, GG}
For example, OG refers to the outcome where the first spin lands on orange and the second spin lands on green.

Required:
Find the probability that both spins land on the same color.