Let $ABCD$ be a isosceles trapezoid such that $AB || CD$ and all of its sides are tangent to a circle. $[AD]$ touches this circle at $N$. $NC$  and $NB$ meet the circle again at $K$ and $L$, respectively. What is $\dfrac {|BN|}{|BL|} + \dfrac {|CN|}{|CK|}$?

$ 
\textbf{(A)}\ 4
\qquad\textbf{(B)}\ 6
\qquad\textbf{(C)}\ 8
\qquad\textbf{(D)}\ 9
\qquad\textbf{(E)}\ 10
$
1. **Understanding the Problem:**
   We are given an isosceles trapezoid \(ABCD\) with \(AB \parallel CD\) and all sides tangent to a circle. The tangency points imply that the circle is the incircle of the trapezoid. We need to find the value of \(\dfrac{|BN|}{|BL|} + \dfrac{|CN|}{|CK|}\).

2. **Using the Power of a Point Theorem:**
   By the power of a point theorem, for point \(N\) on the circle:
   \[
   BN \cdot BL = BM^2 \quad \text{and} \quad CN \cdot CK = CM^2
   \]
   where \(M\) is the midpoint of \(AB\) and \(CD\).

3. **Expressing Ratios:**
   From the power of a point theorem, we can express the ratios as:
   \[
   \frac{BN}{BL} = \frac{BN^2}{BM^2} \quad \text{and} \quad \frac{CN}{CK} = \frac{CN^2}{CM^2}
   \]

4. **Calculating \(BN^2\) and \(BM^2\):**
   Let \(a\) be the length of \(AB\) and \(b\) be the length of \(CD\). Since \(AB \parallel CD\), the height from \(N\) to \(AB\) and \(CD\) is the same. Let \(\phi\) be the angle between \(AD\) and the perpendicular dropped from \(N\) to \(AB\).
   \[
   BN^2 = a^2 + \left(\frac{a}{2}\right)^2 - a^2 \cos \phi = a^2 + \frac{a^2}{4} - a^2 \cos \phi = \frac{5a^2}{4} - a^2 \cos \phi
   \]
   \[
   BM^2 = \left(\frac{a}{2}\right)^2 = \frac{a^2}{4}
   \]
   Therefore,
   \[
   \frac{BN^2}{BM^2} = \frac{\frac{5a^2}{4} - a^2 \cos \phi}{\frac{a^2}{4}} = 5 - 4 \cos \phi
   \]

5. **Calculating \(CN^2\) and \(CM^2\):**
   Similarly, for \(CN\):
   \[
   CN^2 = b^2 + \left(\frac{b}{2}\right)^2 - b^2 \cos(\pi - \phi) = b^2 + \frac{b^2}{4} - b^2 \cos(\pi - \phi) = \frac{5b^2}{4} + b^2 \cos \phi
   \]
   \[
   CM^2 = \left(\frac{b}{2}\right)^2 = \frac{b^2}{4}
   \]
   Therefore,
   \[
   \frac{CN^2}{CM^2} = \frac{\frac{5b^2}{4} + b^2 \cos \phi}{\frac{b^2}{4}} = 5 + 4 \cos \phi
   \]

6. **Summing the Ratios:**
   Adding the two ratios:
   \[
   \frac{BN}{BL} + \frac{CN}{CK} = (5 - 4 \cos \phi) + (5 + 4 \cos \phi) = 10
   \]

The final answer is \(\boxed{10}\).