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Medan, Indonesia
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http://downixs.wordpress.com/2010/01/06/peraturan-sepakbola/
http://www.free-ocr.com/
http://www.youtube.com/watch?NR=1&feature=endscreen&v=whgzwBCHBmk
http://staff.uny.ac.id/sites/default/files/penelitian/Cerika%20Rismayanthi,%20S.Or./artikel%20tenis.pdf
http://stykonstanta.blogspot.com/2012/01/contoh-karya-tulis-untuk-kelas-xi-ipa.html
http://id.wikipedia.org/wiki/Momentum