Hi,
ref=PER ... is the label written by the previous editor, I just copied it (didn't delete it).
layer=0 ... the same thing again.
The original area of the car park was extremely large. unsuitable for subsequent partial modifications, therefore 5 smaller.

"There are at least some 16 ways with the same positions, 8 of those could be removed". ... I don't understand , what, which?
