Code Golf: Duplicate Character Removal in String

Question

LabVIEW 7.1

ONE character and that is the blue constant '1' in the block diagram. I swear, the input was copy and paste ;-)

http://i25.tinypic.com/hvc4mp.png

http://i26.tinypic.com/5pnas.png

Perl

21 characters of perl, 31 to invoke, 36 total keystrokes (counting shift and final return):

perl -pe's/$1//gwhile/(.).*\1/'

Ruby — 61 53 51 56 35

61 chars, the ruler says. (Gives me an idea for another code golf...)

  puts ((i=gets.split(''))-i.select{|c|i.to_s.count(c)<2}).join
+-------------------------------------------------------------------------+
||    |    |    |    |    |    |    |    |    |    |    |    |    |    |  |
|0         10        20        30        40        50        60        70 |
|                                                                         |
+-------------------------------------------------------------------------+
  gets.chars{|c|$><<c[$_.count(c)-1]}

... 35 by Nakilon

APL

23 characters:

(((1+ρx)-(ϕx)ιx)=xιx)/x

I'm an APL newbie (learned it yesterday), so be kind -- this is certainly not the most efficient way to do it. I'm ashamed I didn't beat Perl by very much.

Then again, maybe it says something when the most natural way for a newbie to solve this problem in APL was still more concise than any other solution in any language so far.