--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main_marking5/bf_test4b.scala	Sun Jan 31 03:24:32 2021 +0000
@@ -0,0 +1,10 @@
+import CW10a._
+
+val urban_bench = 
+""">+[<+++++++++++++>-]<[[>+>+<<-]>[<+>-]++++++++
+   [>++++++++<-]>.[-]<<>++++++++++[>++++++++++[>++
+   ++++++++[>++++++++++[>++++++++++[>++++++++++[>+
+   +++++++++[-]<-]<-]<-]<-]<-]<-]<-]++++++++++."""
+
+assert(run(urban_bench, Map()) == 
+  Map(0 -> 10, 5 -> 0, 1 -> 0, 6 -> 0, 2 -> 0, 7 -> 0, 3 -> 0, 4 -> 0))