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$ perl -Mstrict -Mwarnings -E 'my %x = map { $_ => 1 } "A" .. "E"; my 
+@y = keys %x; say "@y"'
A D E C B
...

$ perl -Mstrict -Mwarnings -E 'my %x = map { $_ => 1 } "A" .. "E"; my 
+@y = keys %x; say "@y"'
D E B A C