Let G be the graph below. The edges are labeled by integers.
1. List the edges of the spanning tree of G obtained by the breadth-first search with the vertex ordering a, b, c,..., l. (The answer should be a list of integers (edge labels). The order in the list does not matter.) 1,9,2,11,12,8,3,17,7,4,6
2. List the edges of the spanning tree of G obtained by the depth-first search with the vertex ordering a, b, c,..., l.
1,2,3,4,5,6,7,8,20,18,17