#!/usr/bin/perl -w

%common = map { lc $_, 1 }  qw/ a and the /;
@words = qw/ hello there Hello hello the a A /;
@words = keys %{+{ map { !$common{lc $_} ? (lc $_, 1) : () } @words }}
+;

$/ = "\n";
print @words;

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In reply to RE: List processing performance by visnu
in thread List processing performance by Odud

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