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my %hash = map { $_ => 1 } (1,2,3,5,7,8);

Hash entries are returned in an apparently random order.  The actual r
+andom
order is specific to a given hash; the exact same series of operations
...
details on why hash order is randomized. Aside from the guarantees
provided here the exact details of Perl's hash algorithm and the hash
traversal order are subject to change in any release of Perl.