ONLY ANSWER QUESTION #$2\mathrm{.}3$

$2\mathrm{.}1(15$ points$)$ Find the degree of each node and present the result in a table. Then calculate the

histogram of the degrees, present the result in a table and plot the histogram.

$2\mathrm{.}2(5$ points$)$ List all the triangles in the graph.

$2\mathrm{.}3(5$ points$)$ Compute the density of the graph.