MY-BASIC, 79 bytes

Anonymous function that takes no input and outputs to the console

For I=65 To 90
For J=65 To 90
K=J
If I>K Then K=I
Print Chr(K)
Next
Print;
Next

For I=65 To 90
For J=65 To 90
K=J
If I>K Then K=I
Print Chr(K)
Next
Print;
Next

Try it online!