[(-0.70061682848335272, data1 data2 key1 key2
1 -0.700617 -0.032341 a two),
(-0.49714940778743583, data1 data2 key1 key2
0 -0.497149 0.977912 a one),
(-0.04267521028211408, data1 data2 key1 key2
4 -0.042675 0.097326 a one),
(1.2341451325260737, data1 data2 key1 key2
2 1.234145 1.178135 b one),
(1.5898799814449669, data1 data2 key1 key2
3 1.58988 0.350122 b two)]
=========================
[('a', data1 data2 key1 key2
0 -0.497149 0.977912 a one
1 -0.700617 -0.032341 a two
4 -0.042675 0.097326 a one),
('b', data1 data2 key1 key2
2 1.234145 1.178135 b one
3 1.589880 0.350122 b two)]
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