If edge uv is deleted from G,C and H change as follows. For each clique Ci ⊇ {u, v} with size > k in C,Ci is divided into two cliques Ci − {v} and Ci − {u}. Then, Ci − {u} is inserted
into C as a new maximal clique and Ci is replaced with Ci −{v}. The changes to clique graph H are as follows. Firstly, some existing edges of clique node i are removed if the intersection between Ci and those neighboring cliques is less than k − 1 due to the deletion of node v from Ci . Secondly, a new clique node n+1 corresponding to Ci −{u} is added to H. Thirdly, edges are added between clique node n +1 and other clique nodes if Cn+1 has at least k −1
common nodes with those cliques.
Let’s see some special cases for deleting edge uv. If there is not any clique in C containing both u and v,C and H keeps unchanged. If there is a clique Ci with size = k containing both u and v,Ci is deleted from C and clique node i is removed from H. Based on the analysis above, the algorithm KED is listed in Algorithm 5.
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