It is code or a user defined function. They are ways of creating your own functions or creating code to do stuff automatically.
Try this. Press Alt+F11. Then press Alt, I and then M. This will insert a module. Then paste this code in the module:
Code:
'--------------------------------------------------------------------------------------------------------
'***NEW FUNCTION***
'Description: Returns text equivalent of formula in cell.
Function GetText(cell As Range)
GetText = cell.Formula
End Function
Then go back to your workbook and input this formula:
=SUMPRODUCT(--((RIGHT(gettext($A$1:$A$18),LEN(gettext($A$1:$A$18))-1)=RIGHT(gettext(A1),LEN(gettext(A1))-1))))
Change the ranges to your range for the formula and then you can copy this formula down the column. Anything that is greater than 1 is a duplicate. You can filter on this if you want.
Hope that helps and post back any questions if you are lost.