A lends to B who sells to C who lends to D who sells to E who lends to F who sells to G.
The reverse of the process will unwind it:
G sells to F who returns to E who sells to D who returns to C who sells to B who returns to A
A lends to B who sells to C who lends to D who sells to E who lends to F who sells to G.
The reverse of the process will unwind it:
G sells to F who returns to E who sells to D who returns to C who sells to B who returns to A