14. Xiaoding, Xiaoming, and Xiaoqian are playing a game together and need to determine the order of play. They agree to use "scissors, paper, rock" to decide. What is the probability that all three of them will choose "paper" in one round? $\qquad$ .
14. $\frac{1}{27}$.

Use the tree diagram shown in Figure 8 to list all possible outcomes of a round: the gestures made by the person.
Figure 8
Figure 8 only shows part of the tree diagram (lists 9 possible outcomes, please list 9 outcomes; finally, change “hammer” to list 9 outcomes as well. Therefore, there are a total of 27 outcomes. Hence, $P($ Paper, Paper, Scissors $)=\frac{1}{27}$.