Slide showing a table regarding unknown subject. Slide shows a table regarding unknown subject The table is called 'Table 3' and looks as follows: X Y X Y 1. A 1 2 or A 1 3. X Y 2, A 1 4 B 2 3 X Y 3, A 1 2 B 4 3 X Y X Y 4, A 1 3 or A 1 4 B 4 2 or B 3 2 Late 19th to early 20th century