ner_tags: O O O O O O O B-Person I-Person O O O O O O B-Person I-Person O B-Person I-Person O B-Person I-Person O O O B-Person I-Person O O O O B-Organization I-Organization I-Organization I-Organization I-Organization B-Organization O O O O O O O O O O O O O O O O O O O O O O O O
tokens: Acknowledgments The authors would like to thank Sami Dib for valuable and constructive comments. Also M. Hosseinirad thanks Najmeh Mohammad-Salehi and Maryam Samadi for useful discussions. S. Abbassi acknowledges support from the International Center for Theoretical Physics (ICTP) for a visit through the regular associateship scheme. We also like to thank the anonymous referee for his/her helpful comments which improved the paper.