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  • Thanks a lot. Both your answer and Steven B. Segletes's completely solve my problem. By no means I'm qualified to say whether one is better than the other; the only reason why I accepted the other answer is because it was posted before than yours; please believe me, I'm very grateful to both of you, and would have picked both answers if possible. Commented Feb 15, 2019 at 13:52
  • I'd not forget \bm Commented Feb 15, 2019 at 14:44