Abstract
We prove that a crossing change along a double point circle on a 2 2 -knot is realized by ribbon-moves for a knotted torus obtained from the 2 2 -knot by attaching a 1 1 -handle. It follows that any 2 2 -knots for which the crossing change is an unknotting operation, such as ribbon 2 2 -knots and twist-spun knots, have trivial Khovanov-Jacobsson number.
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