How to create all possible pair combinations without duplicates in Google Sheets?

Question

How to perform iteration over excel/google sheets cells to get pairwise combinations?

\"string1\"

\"string2\"
\"string3\"
...
\"string10\"

Answer 1

=QUERY(ARRAYFORMULA(SPLIT(
 TRANSPOSE(SPLIT(REPT(CONCATENATE(A2:A&CHAR(9)), COUNTA(A2:A)),  CHAR(9)))& " "&
 TRANSPOSE(SPLIT(CONCATENATE(REPT(A2:A&CHAR(9),  COUNTA(A2:A))), CHAR(9))), " ")),
 "where Col1<>Col2 order by Col1", 0)