Random Number Generator

I have attached excel file which contains :
Column 1: Definite
Column 2: Optional

I want to generate list of 2 words adgroups, 3 word adgroups & 4 word adgroups.. Here is how..

Column 3: 2 words adgroups
Take 1st word from column 1
Take 1st word from column 2

Take 1st word from column 1
Take 2nd word from column 2

Column 4: 3 words adgroups
Take 1st word from column 1
Take 2nd word from column 2
Take 3rd word from column 2

Column 5: 4 words adgroups
Take 1st word from column 1
Take 2nd word from column 2
Take 3rd word from column 2
Take 4th word from column 2

I want to generate all possible keywords.. Could anyone tell me how to do this..

I am attaching Excel file for the same..

Pls help.. Thanks a million in advance

Random-Keyword-Reqd.xlsx