% PNAS example 1
% https://www.pnas.org/content/pnas/116/31/15407.full.pdf
% by Vladimir Batagelj, June 17, 2020
*Network PNAS1.net
*Vertices 7
 1 "A1"     0.1789  0.2622  0.5000  ellipse
 2 "A2"     0.4813  0.3611  0.5000
 3 "A3"     0.7601  0.1753  0.5000
 4 "A4"     0.4050  0.1024  0.5000
 5 "B1"     0.2816  0.8229  0.5000  box
 6 "B2"     0.6727  0.8229  0.5000
 7 "B3"     0.4813  0.6667  0.5000
*Arcs
 1  2 1
 1  7 1
 2  3 1
 2  7 1
 3  4 1
 4  1 1
 5  1 1
 5  6 1
 6  7 1
 6  3 1
 7  2 1
 7  3 1
 7  5 1

*Partition Shapes partition of PNAS1.net
*Vertices 7
2
2
2
2
1
1
1