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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