What is the relation between an actor tick and its components' ticks?

What is the default and changeable relation between an actor’s tick and its own components’ ticks in term of order and if any dependencies of one on the other?
In other words, is the default UE4 method is to tick an actor then move to ticking each of this actor’s components before moving to any other actor, or does the engine just deal with all tick-able UObjects in a mishmash manner, if no prerequisite tick dependencies already set?

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