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  1. or download this
    >perl -e "$h{6}=$h{7}=1;for (@ARGV){print qq($_ ) unless $h{$_}}" 1 6 
+2 2 7 1 6 99 99 7
1 2 2 1 99 99
>
  2. or download this
    >perl -e "$h{6}=$h{7}=1;for(@ARGV){$h{$_}||print qq($_ )}" 1 6 2 2 7 1
+ 6 99 99 7
1 2 2 1 99 99
>
  3. or download this
    >perl -e "$h{6}=$h{7}=1;$h{$_}||print qq($_ )for@ARGV" 1 6 2 2 7 1 6 9
+9 99 7
1 2 2 1 99 99
>