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(a) Two configurations of the elastic rod inside a spiral channel: initial (light grey) and final (dark grey). A positive work W is necessary to vary the position of the end point from Γ(ξ2) to Γ(ξ1) and force the rod inside the channel. (b) Upon release, the first endpoint slides back from Γ(ξ1) to Γ(ξ2) and the rod exits the channel with velocity V .
