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  1. or download this
    perl -E 'sub f{say$_[0];f($_[1],$_[0]+$_[1])}f(1,1)' |head -10
    
  2. or download this
    perl -E 'sub f{say$_[0];$_[1]=$_[1]+shift;&f}f(1,1)' |head -10
    
  3. or download this
    perl -E 'sub f{say$_[1];unshift@_,$_[0]+pop;&f}f(1,1)' |head -10