CONCATENATE WITH CRITERIA

[M&M]

I want to concatenate the text in different row but exclude a particular
criteria if it comes up. See below example:

Different Scenarios:
A B C D E
1 undecided John John undecided John
2 undecided Paul undecided Paul Paul
3 undecided undecided undecided undecided Lily

RESULTS: undecided John, Paul John Paul John, Paul, Lily

Basically, I only want the "undecided" shows up only if all three options
are undecided; otherwise only give me the name(s) that is/are suggested.

Thanks.

 

[Dave Peterson]

If all those names are single words:

=IF(COUNTIF(A1:A3,"undecided")=3,"undecided",
SUBSTITUTE(TRIM(SUBSTITUTE(A1&" "&A2&" "&A3,"undecided"," "))," ",", "))

 

[Sheeloo]

Try
=IF(AND(A1="undecided",A2="undecided",A3="undecided"),"Undecided",IF(A1="undecided","",A1&", ")&IF(A2="undecided","",A2&", ")&IF(A3="undecided","",A3))

Hope you can live with an extra comma at the end if third row is
'undecided'...