Use the method of replacing the lower pairs by higher pairs to create new geared linkages groups from the planar Assur groups of six bars, then identify isomorphism according to their each character matrices got by the method of this article.

• （3）对平面六杆低副基本杆组进行低副高代，得到平面六杆低副基本杆组可生成的所有的齿轮连杆基本杆组，然后利用本文的方法求出它们各自的特征矩阵，对这些齿轮连杆基本杆组进行同构识别。