Doubled order (n=4k+2)

There are some wellknown methods to create a magic square of doubled size n=4k+2 from an existing magic square of odd order.

Method
LUX-Method (Conway)
Strachey
Rothstein
Rothstein (Variante 1)
Rothstein (Variante 2, n ⩾ 10)
Unknown author (1)
Unknown author (2)
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