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The reptation method on a square lattice. A chain of 9 monomers is shown, where the polymer ends are indicated with the letters A and B. The thick lines between the circles represent the chain links. The left panel illustrates the initial configuration, which can be changed by selecting any of the six possible jumps of the chain starting at any of its ends (red arrows). The right panel depicts the new configuration after end B has moved downward carrying the whole chain with it.
