$VAR1 = [
          'PPLLOO',
          'HHYYTT',
          'TTRRDD',
          'PPLLOO',
          'TTRRDD',
          'PPLLOO',
          'PPLLOO'
        ];
$VAR1 = {
          'TTRRDD' => 2,
          'PPLLOO' => 4,
          'HHYYTT' => 1
        };
PPLLOO has appeared 4 times.
TTRRDD has appeared 2 times.