0 : 0
Devon McCormick didn't follow step three.  Step 3 is
"item count of razed a" not "item count of raveled a".  Replace the
comma with semi-colon, then continue.  Brian Schott wants my definition
of s.  This message explains a negative consequence of the choice.
Let's try again!  Thanks.


Reminder, the question is

   {::a:
 Is         I expect
+--+         +---+
|++|         |+-+|
||||         ||0||
|++|         |+-+|
+--+         +---+

  please explain this choice?
)


   ] a =: 1;''
+-++
|1||
+-++

   #a
2

   # ; a           NB.  item count of RAZEd a
1

   ] s =: 'a';<<'b'
+-+---+
|a|+-+|
| ||b||
| |+-+|
+-+---+

   s ,&< S: 0 1 {:: s
+-+----+
|a|+-+ |
| ||0| |
| |+-+ |
+-+----+
|b|+-++|
| ||1|||
| |+-++|
+-+----+

   NB. Paths to the leaves

   s (; <@;) S: 0 1 {:: s  NB. Info lost, cannot reconstruct s.
+-+-+
|a|0|
+-+-+
|b|1|
+-+-+
      

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