deleted duplicates

src/providers/connection/district.ts

     }
 
     parseData(data: any) {
-        return data["data"].map(school => new School(school[13]))
+        return data["data"].map(school => school[13]).filter(this.onlyUnique).map(school => new School(school));
+    }
+
+    onlyUnique(value, index, self) { 
+        return self.indexOf(value) === index;
     }