| Tail | {: _ | 
| {:y selects the last item of y , or an
item of fills if y has no items; that is, {:y 
↔ 0{_1{.y . 
The fill atom f is also specified by fit, as in {:!.f  . | 
   ]y=: a.{~ (a.i.'A') + i.4 5
ABCDE
FGHIJ
KLMNO
PQRST
   f=: }: ; {:
   f y
+-----+-----+
|ABCDE|PQRST|
|FGHIJ|     |
|KLMNO|     |
+-----+-----+
   g=: }: ,.@; {:
   g y
+-----+
|ABCDE|
|FGHIJ|
|KLMNO|
+-----+
|PQRST|
+-----+
   h=: {. ,.@; }.
   h y
+-----+
|ABCDE|
+-----+
|FGHIJ|
|KLMNO|
|PQRST|
+-----+
   {:"1 y
EJOT