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To differentiate between various columns and eliminate duplicated occurrences, you can:

1. Check the column headers: Look at the name of the columns and see if they have unique names.

2. Check the data contents: Look at the actual data in each column and see if they contain different information.

3. Use conditional formatting: You can highlight duplicate values or use conditional formatting to identify unique values.

4. Use a formula: You can use a formula like =COUNTIF() to count how many times a value appears in a column.

5. Use the Remove Duplicates feature: Most spreadsheet applications have a built-in feature to remove duplicate entries from a column or range of cells.