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http://pessek.com/pengetian-seks-bebas-dan-dampak-seks-bebas.html

http://sinauwerno-werno.blogspot.com/2012/09/gerak-dasar-permainan-softball.
html

http://sugiartha26.wordpress.com/2010/11/13/pengertian-free-sex-dan-
dampaksosial/

http://zenc.wordpress.com/2007/06/13/napza-narkotika-psikotropika-danrokok-
zat-aditif/

http://sinta97.blogspot.com/2013/02/sejarah-renang-gaya-punggung.html

126 Buku Guru Kelas XI SMA/MA/SMK/MAK