How many cubes are in each Desmond sequence?

There are some spinning cubes hidden in the Desmond sequences of Assassin's Creed Revelations, I was wondering how many are in each sequence?

I found 2 in the first sequence and 1 (#4) in the second.


Yes, it is confirmed that there are 2 in each sequence.
If you want to know how to get them, here is a link.


I found two in five so I'm guessing two each, and that one was numbered 10 in the final room on five so happy hunting