Abstract
It is proved by Ozawa that every knot in the 3-sphere has a unique essential tangle decomposition if it admits an essential free 2-tangle sphere. In this paper, we show that for every integer [Formula: see text] with [Formula: see text], there is a knot in the 3-sphere which admits an essential free [Formula: see text]-tangle decomposition and also admits at least [Formula: see text] distinct essential tangle spheres. To this end, we give examples of nested essential free [Formula: see text]-tangles for every integer [Formula: see text] with [Formula: see text].
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