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  1. or download this
    Benchmark: timing 1000000 iterations of defined, exists...
   defined: 21 wallclock secs (21.36 usr +  0.00 sys = 21.36 CPU)
    exists: 19 wallclock secs (18.45 usr +  0.00 sys = 18.45 CPU)
  2. or download this
    # %hash is a hash with values for one/two/tre/for

...
    1 if exists $hash{xyx};
}
...