Our Contraceptive Debate. (HELP?)

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in speaking of contraceptives, i am not against it, because i know that it'll do good to the economy in terms of population control. anyway, i have a huge problem about it, we're going to have a debate in school next monday about contraceptives, and my professor assigned me to the team AGAINST it. so i really don't have any idea on how to save my team from the other who is PRO. so, if anybody can help me here? i'll very much appreciate it. thank you very much!