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head.next.next doesn't become head. You would lose 2 nodes in one step in that case, and this code is only checking equivalence to eliminate 1 node at a time.
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Delete duplicate-value nodes from a sorted linked list
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head.next.next doesn't become head. You would lose 2 nodes in one step in that case, and this code is only checking equivalence to eliminate 1 node at a time.