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my %entry = ($item_id=>\@data, $item_id=>\@data);
print $entry{$i}->[$j]; # contents of the hash ({}) are array referenc
+es; we use -> to work with references; then we use [] to work with ar
+rays
...
# secondly, hash contents are accessed using {}
# thirdly, it's again a reference
# fourthly, arrays are accessed using []

my $index = $#{$entry{$i}};