After Merging ■“ How do we update the distance matrix?” C2 C1 C5 C3 C4 C3 C1 C4 C2U C5 ? C3 C1 C4 C2U C5 p10p1 p12After Merging ◼ “How do we update the distance matrix?” C1 C4 C2 U C5 C3 ? ? ? ? ? ? ? C2 U C1 C5 C1 C3 C4 C2 U C5 C3 C4 ... p1 p2 p3 p4 p9 p10 p11 p12