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  1. or download this
    my $keys = keys(%r) ;
    
  2. or download this
    my $keys = @keys;
    
  3. or download this
    printf "Number 1: %d\nNumber 2:%d\nNumber 3:%d\n", values(%r);
    
  4. or download this
    printf "No of keys=%d\n", scalar keys(%r);