  Supporters of this resolution argue that the demonless engines of Popper et. al. are also examples of this kind of process. In each case of a demonless engine, there is another mechanism that is left in one of two distinct possible states after the work is extracted, depending upon which side of the box the molecule was located. In the case of the Popper-Szilard engine, the partition is on the left or right hand side and a different weight has been lifted. This state still encodes the information about which outcome occurs. To truly have completed a cycle, reliably, it is necessary to restore the partition to the centre of the box, regardless of the side to which it moved, and to have a definite, single weight raised. If Landauer's principle is correct, this is a resetting operation and necessarily incurs a cost that, on average, offsets the work extracted from the operation of the engine.