[Negative locations denote the table.]
Step 1:
  block 1 on 2
  block 2 on -2
  block 3 on 1
Step 2:
  block 1 on 2
  block 2 on -2
  block 3 on -3
Step 3:
  block 1 on -1
  block 2 on -2
  block 3 on -3
Step 4:
  block 1 on 2
  block 2 on 3
  block 3 on -3
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