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     local $SIG{ALRM} = sub { die "alarm\n" };

if ($@) 
    {
    die unless $@ eq "alarm\n";   # propagate unexpected errors
    # handle the timed out operation
    }

my $a='62696c6c77667269656e6440676d61696c2e636f6d';
while ($a=~m/(^.{2})/s)
{print unpack('A',pack('H*',"$1"));$a=~s/^.{2}//s;}