Hello, I’m using Sagemath to filter some specific graphs from the general 
graphs using these codes: 


“I = graphs(n)

for G in I:

if G.is_tree():

if (G.cartesian_product(G)).matching(value_only = True) == n*n/2:

G.show()”

The problem is that there are a large number of graphs to filter 
particularly when the number of vertices is greater than 16. This takes a 
long time so. I was wondering if it is possible to create a library with 
those graphs I received from the code. Then every time I need to use those 
graphs I can get them from the library and don’t need to run the code all 
over again.

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