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Yes. I think manufacturers are inconsistent with labelleling L1 and L2 on intermediates. Traditionally I recall it being L1 for both 'brown' terminals and L2 for both 'grey', but have seen drawings as per yours with L1 for both terminals facing one 2-way and L2 for both facing the other. Perhaps someone could confirm? I don't usually install light switches so it's ages sinnce I looked at one.
You're right, they do vary from manufacturer
 
You're right, they do vary from manufacturer
They certainly do. More or less any combination you like ?
The common theme seems to be a terminal at the top gets connected to one or other at the bottom ?
(as you might imagine from the construction of the thing). Amongst others Schneider go for L1, L2, L3, L4
 

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No, it wouldn’t. Draw in the lines, and you’ll see. Changing any switch has no effect as the same cables are paralleled at another switch.

The black in the commons just gets linked through the intermediate.
Missed that well spotted ?
 

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