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Which of the following comparative forms is correct?

  1. It is much cheaper to train doctors, teachers, police and other vital public service workers than it is to train astronauts or the scientists and engineers who work on space exploration projects.

  2. It is much cheaper to train doctors, teachers, police and other vital public service workers than to train astronauts or the scientists and engineers who work on space exploration projects.

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I believe both are correct. The second cannot mean anything different. It just uses fewer words. Not a contraction but a shorter sentence. This often happens in speaking where a meaning is understood and fewer words are preferred.

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