My proposed rule is:
The difference between two Limiteds is approx. 20 degrees in the angle of view:

Angle    f/mm
71      30
51      45
31      78

Now the rumoured 120mm fits in when you allow 10 degrees difference for the next round 
of
Limiteds:

21      117

others to follow:
81      25
61      37
41      58
11      225

What 'ya think?

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