Paste tab-delimited rows (from Excel). Verify all row combinations are unique; report duplicates and counts.
Check whether all tab-delimited rows are unique. If duplicates exist, show the duplicated combinations and their counts.
Paste lines copied from Excel. Columns are separated by a Tab character. Empty cells are allowed and compared literally.
When duplicates are found, they are listed one per line as "count \t combination". If there are no duplicates, a green status message is shown.