ONEOK PARTNERS LP


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EX-21
2017-02-28
EX-21
2016-02-23
EX-21
2015-02-25
EX-21
2014-02-25
EX-21
2013-02-26
EX-21
2012-02-21
EX-21
2011-02-22
EX-21
2010-02-23
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