Actually...
The data looks a bit more like this;
AA=value1,BB=value2,CC=value3,BB=value4,BB=value5
AA=value6,BB=value7,BB=value8
AA=value9,BB=value10,CC=value11
AA=value12,BB=value13,CC=value14,BB=value15,CC=value16
There are other fields (CC) that I am not interested in that are mixed up with the BB fields. There is always only one AA field per event. Each BB field may have an associated CC field.
I am only interested in the BB fields per AA
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