@out = grep $sd[$_] ne $sd[1+$_], 0 .. $#sd; With inline sort and a perverse twist: 
my $prev;
@out = grep "$prev" ne ($prev = $_), sort @sd; # not for production co
+de

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Makeshifts last the longest.

In reply to Re^2: Remove Duplicate Lines by Aristotle
in thread Remove Duplicate Lines by dcb0127

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