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A hairpin entry with ml* < m < m*h and only one tail in the deep region leads to a linear translocation. The chain enters the shallow region as a hairpin but m does not exceed the hairpin critical insertion size m*h. The chain end forming the hairpin has no entropic penalty to prevent itself from proceeding into the shallow region and gaining electrostatic energy. If m is larger than the linear critical insertion length ml*, linear translocation occurs.
