How to use Merge Lists
Paste a list in each box and choose a merge mode. Append keeps every item. Merge unique keeps the first exact occurrence. Alternate takes one item from each list, then keeps the longer list’s remainder.
Example
A: 001, 003, 003 B: 002, 003
Unique / Únicos: 001 003 002
Read the result
Pair by position writes two quoted TSV columns and fills missing cells with empty strings. It pairs the first item of A with the first of B, regardless of their values.