Correlacione as 2 colunas:  ...

1-a, 2-b, 3-c, 4-d.

1-d, 2-c, 3-b, 4-a.

1-b, 2-c, 3-a, 4-d.

1-a, 2-b, 3-d, 4-c

1-b, 2-a, 3-d, 4-c.