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I have numpy 2d array with shape = (14542036, 6)
I want to look up the same using:
>>>a
array([[ 4287053, 6218896, 19801222, 19810901, 19881222, 29],
[ 4287053, 6218896, 19801222, 19810901, 19850211, 28],
[ 4289713, 6222552, 19810105, 19810915, 19930330, 138],
...