Execution of this sequence turns the entire buffer upside-down. Not very
useful; only an effective demonstration of the brute force available via a
simple (or at least: short) command-sequence.

z u2
0 u1
q2 < q2-%1 j
      a u0
      z j
      q0 i
   >
0 , z/2 k ESC ESC

The Windows-version has the requisite setting built into the CTRL_X-
command, which is of course the preferred method there.