Figure 1 description

An array of 10 nodes in three columns and seven rows. First row has one center column node, S1. Second row has two nodes, one in the right column, S2 and one in the left S3 Third row has two nodes, one in the right column, S4 and one in the left S5. Fourth row has one center column node, S6. Fifth row has two nodes, one in the right column, S7 and one in the left S8. Sixth row has one center column node, S9. Seventh row has one center column node, S10.

Lines connect S6 to all the other nodes except S10; lines also connect S1 to S2 and S3 and S9 to S7, S8, and S10 and S10 to S7 and S8. Lines also connect nodes in the same row and also adjacent ones in the same column.