deletions | additions       diff --git a/Graph_structures_A_simple_graph__.md b/Graph_structures_A_simple_graph__.md  index b6a4042..6ce5c5c 100644  --- a/Graph_structures_A_simple_graph__.md  +++ b/Graph_structures_A_simple_graph__.md 
...
## #  Graph structures A simple graph is a collection of vertices and edges. The most basic distinction is: directed vs undirected, weighted vs unweighted, both referring to the edges.