[deal.II] can an FECollection take the place of a FiniteElement in an FESystem?

[Daniel Goldberg]

The subject basically says it all. I see FESystem inherits from 
FiniteElement, so an FESystem can take the place of a FiniteElement 
object in an FECollection, but I don't see that FECollection can be used 
interchangeably with a FiniteElement object - can it?
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