Please solve by hand

(a) Perform the Single Link Clustering of the following data. Give partial results after each step. A B C D E F G . 0 2 3 5 8 13 19 B 0 1 2 4 8 15 C 0 3 9 20 45 D 0 5 22 91 E 0 7 33 F o 6 G 0 (b) How to modify the distance matrix by changing a minimal number of entries to get the cluster {A, B,C,G} after 3 iterations of the algorithm