Constructing a Spanning Tree a a 1 0.Let a be the starting vertex,selecting edges one by one in original R 1.Merging a and c into a'(fa,c)),selecting (a,c) 2.Merging a'and b into a"(fa,c,b)),selecting (c,b) 3.Merging a"and d into a"(a,c,b,d)),selecting (a,d)or(d,b) Ending,as only one vertex leftConstructing a Spanning Tree a b c d a b a b a b c c d c d d 0. Let a be the starting vertex, selecting edges one by one in original R 1. Merging a and c into a’({a,c}), selecting (a,c) 2. Merging a’ and b into a”({a,c,b}), selecting (c,b) 3. Merging a” and d into a”’({a,c,b,d}), selecting (a,d) or (d,b) Ending, as only one vertex left (0) (1) (2) (3)