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Σ-Graph
Label all vertices of the graph with numbers so that for each vertex the sum of numbers on its adjacent vertices is the same.
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You are given a graph with n vertices. Label each vertex with a number.
All numbers should be distinct and from 1 to n inclusive.
To mark a vertex, click on it as many times as you need.
To make it easier for you, one vertex will be pre-marked and the target sum will be written under the graph.
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Required sum: 9