Triangle $ ABC$ is isosceles with $ AC \equal{} BC$ and $ \angle{C} \equal{} 120^o$. Points $ D$ and $ E$ are chosen on segment $ AB$ so that $ |AD| \equal{} |DE| \equal{} |EB|$. Find the sizes of the angles of triangle $ CDE$.
1. Given that triangle \( ABC \) is isosceles with \( AC = BC \) and \( \angle C = 120^\circ \). Points \( D \) and \( E \) are chosen on segment \( AB \) such that \( AD = DE = EB \).

2. Since \( AD = DE = EB \), point \( D \) divides \( AB \) into three equal segments. Let \( M \) be the midpoint of \( AB \). Then \( D \) and \( E \) are symmetric with respect to \( M \).

3. Consider the projections of \( D \) and \( E \) onto \( AC \) and \( BC \) respectively. Let \( K \) be the projection of \( D \) onto \( AC \) and \( L \) be the projection of \( E \) onto \( BC \).

4. Since \( D \) and \( E \) are equidistant from \( A \) and \( B \), and \( M \) is the midpoint of \( AB \), we have \( DK = \frac{1}{2}AD = DM \). Thus, \( DK = DM \), implying that \( CD \) is the bisector of \( \angle ACM \).

5. Since \( \angle ACB = 120^\circ \) and \( M \) is the midpoint of \( AB \), \( \angle ACM = 60^\circ \). Therefore, \( \angle DCM = 30^\circ \).

6. Similarly, \( \angle ECL = 30^\circ \) because \( E \) is symmetric to \( D \) with respect to \( M \).

7. Now, consider triangle \( CDE \). Since \( D \) and \( E \) are symmetric with respect to \( M \), \( \angle DCE = 60^\circ \).

8. To find \( \angle CDE \) and \( \angle CED \), note that \( \angle CDE + \angle CED + \angle DCE = 180^\circ \). Given \( \angle DCE = 60^\circ \), we have:
   \[
   \angle CDE + \angle CED = 120^\circ
   \]

9. Since \( CD = CE \) (as \( AC = BC \) and \( D \) and \( E \) are symmetric), triangle \( CDE \) is isosceles with \( CD = CE \). Therefore, \( \angle CDE = \angle CED \).

10. Let \( \angle CDE = \angle CED = x \). Then:
    \[
    x + x + 60^\circ = 180^\circ
    \]
    \[
    2x = 120^\circ
    \]
    \[
    x = 60^\circ
    \]

11. Thus, \( \angle CDE = \angle CED = 60^\circ \).

Conclusion:
\[
\boxed{60^\circ, 60^\circ, 60^\circ}
\]