--7079
Since 21412136-92=2049 2044 and 7171-92=7079, we know that the duplicate companies were extracted successfully.
I then wrote a query to check whether the IPO issue date or announced date of the MA was earlier and used that to indicate whether I chose the company to have undergone an MA or an IPO in the column MSvsIPO. A 0 in the column represented an MA being chosen and a 1 represented an IPO being chosen.