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    <p>Own solution not the best, but it is suficient to acomplish the fallowing. Acomplished with combinatorics jar. Hole it helps</p> <pre><code> @SuppressWarnings("unchecked") public static void drawMatrix(Graph g, int tempMatrixSize){ System.out.println(" "); System.out.println("Matrix:"); ArrayList&lt;Node&gt; nodesSet = new ArrayList&lt;&gt;(); nodesSet = (ArrayList&lt;Node&gt;) g.getNodes().clone(); int size = nodesSet.size(); int[][] matrix = new int[size][size]; System.out.print(" "); for (Node node : nodesSet){ System.out.print(" " + node.getName()+ " "); } System.out.println(); for (int i=0; i&lt;size; i++) { System.out.print(nodesSet.get(i).getName()+ " "); for (int j=0; j&lt;size; j++){ if (i == j) { System.out.print(" 1 "); matrix[i][j] = 1; } else{ if (nodesSet.get(i).isFriend(nodesSet.get(j))) { System.out.print(" X "); matrix[i][j] = 1; } else { System.out.print(" 0 "); matrix[i][j] = 0; } } } System.out.println(); } System.out.println(); // temp matrix int[][] tempMatrix = new int[tempMatrixSize][tempMatrixSize]; // Find combinations ArrayList&lt;Integer&gt; al= new ArrayList&lt;&gt;(); for (int i = 0; i&lt;size; i++ ){ al.add(i); } ICombinatoricsVector&lt;Integer&gt; initialVector = Factory.createVector(al); Generator&lt;Integer&gt; gen = Factory.createSimpleCombinationGenerator(initialVector, tempMatrixSize); int index = 0; for (ICombinatoricsVector&lt;Integer&gt; combination : gen) { boolean isConnected = true; System.out.println(combination); List&lt;Integer&gt; comb = combination.getVector(); for(int i=0; i&lt;tempMatrixSize; i++){ for(int j=0; j&lt;tempMatrixSize; j++){ tempMatrix[i][j] = matrix[comb.get(i)][comb.get(j)]; // System.out.print(tempMatrix[i][j]+ " "); } System.out.println(); } // main matrix coordinations System.out.println("main matrix used coords: "); for(int i=0; i&lt;tempMatrixSize; i++){ for(int j=0; j&lt;tempMatrixSize; j++){ tempMatrix[i][j] = matrix[comb.get(i)][comb.get(j)]; System.out.print("["+comb.get(i)+","+comb.get(j)+"] "); } System.out.println(); } System.out.println(); for(int i=0; i&lt;tempMatrixSize; i++){ for(int j=0; j&lt;tempMatrixSize; j++){ if (tempMatrix[i][j] == 0){ isConnected = false; } } } if (isConnected) { System.out.println("Is connected by &gt;" + tempMatrixSize); for (int i=0; i&lt;tempMatrixSize; i++) { System.out.println(" &gt;" +nodesSet.get(comb.get(i)).getName()); } } } </code></pre>
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