Combine cell data based on adjacent cells?

Combine cell data based on values in adjacent cells. Sample screenshot attached.

Is there a formula or VBA that can achieve this?
It's OK to have helper columns if needed.
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Martin LissOlder than dirtCommented:
If you can, please attach a sample workbook.
Sasha2016Author Commented:
Spreadsheet attached....thanks
Sasha2016Author Commented:
Would it be easier if there are blank rows separating cells?

I've been trying (without success) to find a VBA code that would do following:
If AB is NOT blank, concatenate values from AD until blank row reached
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Sasha2016Author Commented:
Will revise and re-post....added blank rows (hopefully it will be easier for VBA code)
Martin LissOlder than dirtCommented:
It's not necessary. I'll have your solution in a few minutes.
Sasha2016Author Commented:
Sound like solution is coming soon :)
Sasha2016Author Commented:
Hi Martin,
See attached sample, if it's easier to achieve this with blank rows, that would work too....which ever version of the file works for you.
Martin LissOlder than dirtCommented:
This works with no blank lines.

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Sasha2016Author Commented:
Hi Martin,
Thanks for this...It's huge help!
Only thing I noticed that needs a tweak is the last row with adds a bunch of semi-colons    ;;;;;;;;;;
Any way to correct that?
Sasha2016Author Commented:
Never mind...I found a work-around. I'll have it delete rows after last one with info prior to running your code.
Just tested great!

Thanks again!
Martin LissOlder than dirtCommented:
Sorry I didn't notice that. There was some formatting below row 91 that caused VBA to miscalculate the last row with data. That's been corrected in the attached workbook.
Sasha2016Author Commented:
Thanks again...I was really stuck on this :)
Martin LissOlder than dirtCommented:
You’re welcome and I’m glad I was able to help.

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