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                print ("1st: $array1[0]");
        print ("2nd: $array1[1]");
...
        print ("11th: $array1[10]");
        print ("12th: $array1[11]");

1st: ARRAY(0x7fd4bb012010)
...
Use of uninitialized value $array1[10] in concatenation (.) or string
Use of uninitialized value $array1[11] in concatenation (.) or string