What is the Alpha++ cities according to think tank, GWaC.

Both London and New York
Just Tokyo
Just New York
Just London
Just Paris
Both Tokyo and London
Both Paris and London
Both Tokyo and New York
Both Paris and New York
Both Tokyo and Paris
Both New York and Paris
Tokyo, London and New York
Tokyo, London and Paris
New York, Tokyo and London
London, Paris and New York
New York, Paris and Tokyo
All four combined
None of these
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