Exporting a key words in google sheets

Question

I have keywords in one column (A1:A5) separated by comma:

• keyword1, keyword2, keyword3
• keyword2, keyword4
• keyword1
• keyword1
• keyword2

And I would like to export all 4 keywords in one row: (keyword1, keyword2, keyword3, keyword4)

I have used =(arrayformula(SPLIT(A1:A5,",",TRUE))) and I have received a 2D table. I am looking for option to show all the keywords in one row. I will use the function UNIQUE at the end.

Thank you.

Answer 1

请尝试（未检查）：

=join(", ",unique(transpose(split(join(", ", A1:A5), ", "))))