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{\bf Some questions}  \begin{enumerate}  \item What happens if an interior {\it interior} or bulk  DNA piece approaches the pore? \item In \citet{http://adsabs.harvard.edu/abs/2013PhRvE..87d2723R} page 5, it is claimed that motion will be a superposition of longitudinal and transverse. Is this true -- won't one of them be unstable (in the case where work done in dragging is less than $T$, say)?