== crossing: address
  pair 7,9     n= 7: over yes  part yes  middle yes  surplus no  reaches no
  pair 7,9     n= 9: over yes  part yes  middle yes  surplus no  reaches no
  pair 6,10    n= 6: over no  part no  middle no  surplus no  reaches no
  pair 6,10    n=10: over no  part no  middle no  surplus no  reaches no
  trio 7,9,11  n= 7: over yes  part yes  middle yes  surplus yes  reaches yes
  trio 7,9,11  n= 9: over yes  part yes  middle yes  surplus no  reaches no
  trio 7,9,11  n=11: over yes  part yes  middle yes  surplus yes  reaches yes
  trio 7,9,6   n= 7: over yes  part yes  middle yes  surplus no  reaches no
  trio 7,9,6   n= 9: over yes  part yes  middle yes  surplus yes  reaches yes
  trio 7,9,6   n= 6: over no  part yes  middle yes  surplus yes  reaches yes
  trio 6,10,14 n= 6: over no  part no  middle no  surplus no  reaches no
  trio 6,10,14 n=10: over no  part no  middle no  surplus no  reaches no
  trio 6,10,14 n=14: over no  part no  middle no  surplus no  reaches no
== crossing: sequencing
  pair 7,9     n= 7: over yes  part yes  middle yes  surplus yes  reaches yes
  pair 7,9     n= 9: over yes  part yes  middle yes  surplus no  reaches no
  pair 6,10    n= 6: over no  part no  middle no  surplus no  reaches no
  pair 6,10    n=10: over no  part no  middle no  surplus no  reaches no
  trio 7,9,11  n= 7: over yes  part yes  middle yes  surplus yes  reaches yes
  trio 7,9,11  n= 9: over yes  part yes  middle yes  surplus yes  reaches yes
  trio 7,9,11  n=11: over yes  part yes  middle yes  surplus yes  reaches yes
  trio 7,9,6   n= 7: over yes  part yes  middle yes  surplus yes  reaches yes
  trio 7,9,6   n= 9: over yes  part yes  middle yes  surplus yes  reaches yes
  trio 7,9,6   n= 6: over no  part yes  middle yes  surplus yes  reaches yes
  trio 6,10,14 n= 6: over no  part no  middle no  surplus no  reaches no
  trio 6,10,14 n=10: over no  part no  middle no  surplus no  reaches no
  trio 6,10,14 n=14: over no  part no  middle no  surplus no  reaches no
== crossing: sign
  pair 7,9     n= 7: over yes  part yes  middle yes  surplus no  reaches no
  pair 7,9     n= 9: over yes  part yes  middle yes  surplus no  reaches no
  pair 6,10    n= 6: over no  part no  middle no  surplus no  reaches no
  pair 6,10    n=10: over no  part no  middle no  surplus no  reaches no
  trio 7,9,11  n= 7: over yes  part yes  middle yes  surplus no  reaches no
  trio 7,9,11  n= 9: over yes  part yes  middle yes  surplus no  reaches no
  trio 7,9,11  n=11: over yes  part yes  middle yes  surplus no  reaches no
  trio 7,9,6   n= 7: over yes  part yes  middle yes  surplus no  reaches no
  trio 7,9,6   n= 9: over yes  part yes  middle yes  surplus no  reaches no
  trio 7,9,6   n= 6: over no  part no  middle no  surplus no  reaches no
  trio 6,10,14 n= 6: over no  part no  middle no  surplus no  reaches no
  trio 6,10,14 n=10: over no  part no  middle no  surplus no  reaches no
  trio 6,10,14 n=14: over no  part no  middle no  surplus no  reaches no
