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tokens: We thank the staff at the Nobeyama Radio Observatory and the National Radio Astronomy Observatory for help with the observations. We thank Dr. David Frayer for his help in the observations at the GBT. M.A. thanks the Grant-in-Aid for Scientific Research on Innovative Areas (Grant No. 25108002), Grant-in-Aid for Scientific Research (C) (Grant No. 15K05395), and the Institute for Quantum Chemical Exploration.