Distinct (nonisomorphic) trees
"Construct all non-isomorphic trees of order 7"
How to do that in Sage ?! Please help
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[This](http://lmgtfy.com/?q=generation+of+trees+sage&l=1) might help.
http://www.sagemath.org/doc/reference/graphs/sage/graphs/graph_generators.html#sage.graphs.graph_generators.GraphGenerators.trees is a bit hidden