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The Ferrari man admits it's tough to work out what is making the Red Bulls so dominant.
"It would be nice if we knew that," Alonso told Die Welt.
"It is incredibly difficult to figure out why the competition is better here and there. And so it is hard to copy them."
As happened with the double-diffusers last year and the f-ducts this year, teams often attempt to copy each other's designs and set-ups in order to emulate their performances.
"But whether it always works is a different matter," Alonso said of the practice.
"Because every team also has its own design philosophy into which fits the next elements. It means that you have to develop better in your own direction," he added.
Source: Planet-F1