pandas.tseries.offsets.CustomBusinessMonthEnd.m_offset
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CustomBusinessMonthEnd.m_offset 
    © 2008–2012, AQR Capital Management, LLC, Lambda Foundry, Inc. and PyData Development Team
Licensed under the 3-clause BSD License.
    https://pandas.pydata.org/pandas-docs/version/0.24.2/reference/api/pandas.tseries.offsets.CustomBusinessMonthEnd.m_offset.html