This is an Excel97/2000 method. It is required to perform more complicated merging than the normal set_align('merge'). It merges the area given by its arguments.
Parameter
integer $first_row - First row of the area to merge
integer $first_col - First column of the area to merge
integer $last_row - Last row of the area to merge
integer $last_col - Last column of the area to merge
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