A $5-$bit word is an ordered quintuple $(x_1,x_2,x_3,x_4,x_5)$ with $x_{i}in\{0,1\},i=1$dots$5.$ The set of all $5-$bit

words has $32$ distinct elements. The number of words such that ${\displaystyle \underset{i=1}{\overset{5}{}}}{x}_i=3$ is: