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https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwi65IC1l5LdAhXNFIgKHXgABPMQjRx6BAgBEAU&url=https%3A%2F%2Fwww.sws.org.ph%2Fswsmain%2Fartcldisppage%2F%3Fartcsyscode%3DART-20180628003935&psig=AOvVaw0VrntHOGO8TYittHUvS852&ust=1535629375016893
http://e.news5.com.ph/news5/wp-content/uploads/2018/06/sws-area-and-local-640x480.jpg
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https://vittana.org/12-federalism-pros-and-cons
https://www.youtube.com/watch?v=8TluKV4oTQ8
https://www.youtube.com/watch?v=cMs3tx_jdm4
https://www.youtube.com/watch?v=GRmEpqv5xs8