Again, what have you done to start a solution?
For each of the following degree sequences, prove that a simple graph with 7 vertices exists or does not exist by either drawing such a graph or showing mathematically that such a
graph is impossible.
(a) 1,1,2,3,4,5,6.
(b) 0,0,2,3,4,5,6.
(c) 1,1,3,3,3,5,5.
(d) 3,3,3,3,3,3,6.
(e) 3,3,3,3,4,4,6.
(f) 2,3,4,4,4,4,5.