Devon:

   sel=: (_&[`{) @. ([ < [: # ])

quite slick.  Maybe it gets easier with time to trace something all the way
through a train in a complete way.  Append a special value to the list we
are selecting from might work too I suppose.

Raul:

4 train ::iFailed i.4

it took me a while to see the significance of "do bind" in iFailed.  I see
the need now, but not yet fully.

Do: Okay.  No problem.

Bind: it's a conjunction.  Rightmost y is a verb of infinite rank.

Is Bind

  2: 'x@(y"_)'

similar to

  @:

thanks,
-Steven
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