>> |  RL02  |
>> +--------+
>> |  RX02  | 
    |  RX02  |
   +--------+
   |  RL02  | 
I do note RL02-on-RX02 versus RX02-on-RL02; if one has something
important near the top or bottom of its space, that could well be the
relevant difference here.
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