* from every vertex to every other vertex, which is computed in the
* first stages of the algorithm. This value's type must be a model
* of BasicMatrix with value type equal to the value type of the
- * weight map. The default is a a vector of vectors.
+ * weight map. The default is a vector of vectors.
*
* \param spring_strength (UTIL/OUT) will be used to store the
* strength of the spring between every pair of vertices. This
* value's type must be a model of BasicMatrix with value type equal
- * to the value type of the weight map. The default is a a vector of
+ * to the value type of the weight map. The default is a vector of
* vectors.
*
* \param partial_derivatives (UTIL) will be used to store the