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no-op

   A machine instruction that does nothing (sometimes used in
   assembler-level programming as filler for data or patch areas, or
   to overwrite code to be removed in binaries).  See also JFCL.
   2. A person who contributes nothing to a project, or has nothing
   going on upstairs, or both.  As in "He's a no-op."  3. Any
   operation or sequence of operations with no effect, such as
   circling the block without finding a parking space, or putting
   money into a vending machine and having it fall immediately into
   the coin-return box, or asking someone for help and being told to
   go away.  "Oh, well, that was a no-op."  Hot-and-sour soup (see
   great-wall) that is insufficiently either is `no-op soup';
   so is wonton soup if everybody else is having hot-and-sour.