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  1. or download this
    use strict;
use warnings;
...
print \$_, "\n" for map @$_, @{$a};#one of your way
print "=======\n";
foreach (@$a) { print \$_, "\n" foreach @$_ }#your other way
  2. or download this
    SCALAR(0x15551a4)
SCALAR(0x15551b0)
...
SCALAR(0x155abd4)
SCALAR(0x155500c)
SCALAR(0x1571284)