G2.2 Three boys $B_{1}, B_{2}, B_{3}$ and three girls $G_{1}, G_{2}, G_{3}$ are to be seated in a row according to the following rules:
1) A boy will not sit next to another boy and a girl will not sit next to another girl,
2) Boy $B_{1} `$ must sit next to girl $G_{1}$
If $s$ is the number of different such seating arrangements, find the value of $s$.