While students walk up and down stairs, depending on the school building or classroom lessons, students must attend at the front row ahead of up-down and right-aligned.
As students walk up and down stairs, or on school property or change classes, students have to line up in front of it. And went up - to the right customers.
While students walk up and down the stairs, up on the school building or change the class, students must line up the front of the room, and walked up and down on the right hand side. Always .