Nostalgic old-timers will be happy to see the return of Modifier Trains,
such as (@/), which were in early J but were deleted long ago. See
https://code.jsoftware.com/wiki/Vocabulary/fork#invisiblemodifiers .
These trains were one of Ken Iverson's elegant brilliancies. Few used
them, and they are not needed, because anything they do can also be done
with explicit modifiers ({{ u @ v/ }} is equivalent to (@/)). No one
need rush out and look at them.
We have brought them back because to do so was easier than updating all
the old J literature that refers to the forms. And because they're cool.
Henry Rich
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