I want to delete certain rows from a table.
The conditions are : if column 1 = colum 2 ( like 1 in the example below)
and if the combination of colum 1 and column 2 has shown up in the table before ( like 2 and 4 in the example below)
1 Metabolite A Metabolite A
2 Metabolite A Metabolite B
3 Metabolite A Metabolite C
4 Metabolite B Metabolite A
5 Metabolite B Metabolite C
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