I would say 5-7 days in Buenos Aires (including a day trip to Colonia). Then pick a side trip such as Iguazu Falls or Mendoza. You can find my recent trip report by clicking on my name.A was one of my least favourite cities so I would give it 3 days but a lot of people love it so 4-5 days seems reasonable. If you like cities then I guess you could go to Santiago but I would suggest going to El Calafate and see some glaciers or go up north to Iguassu to see the falls.
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synergism Cooperative action, especially of groups of muscles, so as to achieve an end impossible by individual action. synergism a chemical phenomenon in which the combined activity of two or more compounds is greater than the sum of the individual activities. For example, CYTOKININ and AUXIN act synergistically in promoting DNA replication.