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      2 use SDBM_File;
      3 use MLDBM qw (SDBM_File);
...
     24         print "value is: .$_.\n";
     25     };
     26 };

key: .1. value: .first.
key: .2. value: .second.
...
value is: .a.
value is: .b.
value is: .c.

key: .1. value: .first.
key: .2. value: .second.
key: .3. value: .third.
SDBM_File doesn't define an EXISTS method at dbm.pl line 18