From ae6a912a3beb6710c8f52b0a86dc9497aaff7213 Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Mon, 14 Jan 2019 13:33:24 +0000
Subject: [PATCH] wip

---
 parse-input-graph | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/parse-input-graph b/parse-input-graph
index 8b512a7..37e7a54 100755
--- a/parse-input-graph
+++ b/parse-input-graph
@@ -159,6 +159,7 @@ sub dual () {
   # anticlockwise end of the i'th listed edge of Region Name.
 
   foreach my $ra (sort keys %region) {
+    next if $ra eq 'L' or $ra eq 'NZ';
     my $adjsa = $region{$ra}{Adj};
     foreach my $adjia (0..$#$adjsa) {
       my $adja = $adjsa->[$adjia];
@@ -166,6 +167,7 @@ sub dual () {
       # $va is the vertex at the anticlockwise end
       # of edge no.$adjia of region $ra
       my $rb = $adja->{Name};
+      next if $rb eq 'L' or $rb eq 'NZ';
       # $rb is the region on the other side of that edge
       my $adjsb = $region{$rb}{Adj};
       foreach my $adjib (0..$#$adjsb) {
-- 
2.30.2