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1.import { Observable } from "rxjs/Observable";
getElementTemplateNames() : Observable<string[]> {
let names : string[] = MockedElementData.getNames();
return Observable.create( observer => {
    observer.next(names);
    observer.complete();
});}

2.Observable.of(MOCKEDDATA).delay(1000)

3.import { of } from 'rxjs';
return of(MOCKEDDATA);