HELP!!!

I have been trying and trying...but no luck. Here is the issue..

I have in column D a name and in column E a name and in column A and address.

Now...in either column D or E there could be several instances where the
name appear several times. Keeping in mind that I have about 15,000 rows to
search/find.

D E A
name1 name4 address1
name1 name4 address2
name1 name4 address3
name1 name4 address4
name2 name5 address5
name2 name5 address6
name3, etc. name6, etc. address7, etc.

What I need to do is search column E for exact same name, search column D
for another name which will be different than the name in column E but will
have the same exact number of same name as in column D. Once the search is
complete I need to go to column A take those addresses in the same rows as
the same names and concatenate them into the first row where the first
address cell appears.


D E A
name1 name4 address1, address2, address3, address4
name1 name4
name1 name4
name1 name4
name2 name5 address5, address6
name2 name5
name3, etc. name6, etc. address7, etc.

These would all be real names and address and not name1, etc. that I am
working with.

PLEASE HELP....THERE HAS TO BE A WAY!!!

THANK YOU VEYR MUCH!!!!