RosettaCodeData/Task/Null-object/J/null-object-3.j

   1 1 0 1#3 4 _ 5
3 4 5
   I.1 1 0 1
0 1 3
   0 1 3 { 3 4 _ 5
3 4 5
   1 1 0 1 #inv 3 4 5
3 4 0 5
   1 1 0 1 #!._ inv 3 4 5
3 4 _ 5