HOMEMatrix 
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The effect is performed when the lower left card is raised picking up the coin at the
same time in such a way the audience does not realize the coin was picked up also.
The upper left card is raised to reveal two coins accomplishing the first transposition
from the point of view of the audience. The card with the concealed coin is placed at
the upper left position. These two actions are repeated with the upper left and upper
right positions causing another coin to magically travel to the upper left position. The
finish requires no moves at all for the coin is already there due to the preceding moves.
The upper left card and lower right cards are raised to show the third transposition.
That is roughly it, so you know what to expect.