[Clauses (a) to (e)] To limit the probability of delays in the evacuation or movement of persons to a safe place in an emergency, which could lead to harm to persons.
[Clause (f)] To limit the probability that loose chairs will be pushed out of alignment in an emergency, which could lead to blockage of aisles or space between rows of seats, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.