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  1. or download this
      DB<50> sub tst { "a".."d" }
    
    ...
      DB<54> x tst()              # once flip-flop, always flip-flop
    0  0
      DB<55>
    
  2. or download this
        
      DB<44> sub tst { reverse "a".."d" }
    
    ...
    2  'b'
    3  'a'
      DB<48>
    
  3. or download this
      DB<55> sub tst { reverse reverse "a".."d" }
    
  4. or download this
      DB<59> sub tst { @{["a".."d"]} }
    
    ...
    2  'c'
    3  'd'
      DB<63>