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  1. or download this
      DB<1> @a=1..2
 
...
  DB<6> x @a[1,2]
0  undef
1  undef
  2. or download this
      DB<5> x (1,2)[0,1]
0  1
...
  DB<9> x (undef,undef)[0,2]        
0  undef
1  undef