7_nb13_nb7-8_sb1 7 7 0 0 0 1_se1 nb1 0 0 0 0 0 0 0 0 0 0 0 ne1_ne7-8
sb2_sb7-8 0 0 0 7 2_se2 nb2_nb3 0 0 0 ne3 nb4_sb3 3 3 3 0 0 ne4 4_nb5_nb6_sb4 4 4 0 0 0 0 ne5 5_sb5 0 0 0 0 5_ne6_se5 nb6 0 0 0 0 ne13_ne2_ne6_se3_se4_se7-8
nb10_nb11-12_sb13 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ne10 10_sb10 0 0 11 0 0 0 0 0 0 0 0 0 ne11-12_se10
nb9_sb11-12 0 0 0 0 0 0 0 0 ne9 11_sb9 9 0 0 se11-12_se13_se9
