Help for this page
[A1,B1],[A1,B2],[A2,B1],[A2,B2] (variants over 2 fields)
record 1 - contains [A1,B1] record 2 - contains [A1,B2] record 3 - contains [A2,B1]
record 1 - [A1,B1] record 2 - [A2,B2]