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  1. or download this
     

  DB<26>  @a = (2 .. 9);
...
  DB<66> p defined $a[0]

  DB<67>
  2. or download this
    
  DB<40>  @a = (0..4)
...
  DB<45>  p scalar @a
4
  DB<46>
  3. or download this
    DB<56>  x @a
0  undef
...
  DB<60>  p exists $a[5]
1
  DB<61>