 For any c.e. degrees \(\mathbf{a} &lt;_T \mathbf{b}\), there is a c.e. degree \(\mathbf{c}\) such that \(\mathbf{a} &lt;_T \mathbf{c} &lt;_T \mathbf{b}\) (Sacks 1964). Thus unlike the Turing degrees in general, the c.e. degrees are densely ordered.