Who says string theory doesn't make predictions? It makes *lots* of them. 
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Exercise: Compute in plain QFT the number of consistent models with exactly the same field content as the standard model. Do you get a finite number? If not, do you get at least a finite-*dimensional* space of choices? If not, reflect on what's going on.
Are you talking about after gauge fixing and assigning representations under the gauge groups?
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Olay, I'll send a list of hints for how to solve the exercise. Watch the linear thread down from my previous message.
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