diff -r f2994a2b10b2 -r a82713ed19f3 src/work/marci/max_flow_demo.cc
--- a/src/work/marci/max_flow_demo.cc	Tue Aug 31 13:40:07 2004 +0000
+++ b/src/work/marci/max_flow_demo.cc	Tue Aug 31 17:54:22 2004 +0000
@@ -1,4 +1,9 @@
 // -*- c++ -*-
+
+// Use a DIMACS max flow file as stdin.
+// max_flow_demo < dimacs_max_flow_file
+
+
 #include <iostream>
 #include <fstream>
 
@@ -15,9 +20,6 @@
 
 using namespace hugo;
 
-// Use a DIMACS max flow file as stdin.
-// max_flow_demo < dimacs_max_flow_file
-
 int main(int, char **) {
 
   typedef SageGraph MutableGraph;
@@ -102,23 +104,23 @@
     }
   }
 
-//   {
-//     std::cout << "on-the-fly blocking flow augmentation ..." << std::endl;
-//     FOR_EACH_LOC(Graph::EdgeIt, e, g) flow.set(e, 0);
-//     ts.reset();
-//     int i=0;
-//     while (augmenting_flow_test.augmentOnBlockingFlow2()) { ++i; }
-//     std::cout << "elapsed time: " << ts << std::endl;
-//     std::cout << "number of augmentation phases: " << i << std::endl; 
-//     std::cout << "flow value: "<< augmenting_flow_test.flowValue() << std::endl;
+  {
+    std::cout << "on-the-fly blocking flow augmentation ..." << std::endl;
+    FOR_EACH_LOC(Graph::EdgeIt, e, g) flow.set(e, 0);
+    ts.reset();
+    int i=0;
+    while (augmenting_flow_test.augmentOnBlockingFlow2()) { ++i; }
+    std::cout << "elapsed time: " << ts << std::endl;
+    std::cout << "number of augmentation phases: " << i << std::endl; 
+    std::cout << "flow value: "<< augmenting_flow_test.flowValue() << std::endl;
 
-//     FOR_EACH_LOC(Graph::EdgeIt, e, g) {
-//       if (cut[g.tail(e)] && !cut[g.head(e)] && !flow[e]==cap[e]) 
-// 	std::cout << "Slackness does not hold!" << std::endl;
-//       if (!cut[g.tail(e)] && cut[g.head(e)] && flow[e]>0) 
-// 	std::cout << "Slackness does not hold!" << std::endl;
-//     }
-//   }
+    FOR_EACH_LOC(Graph::EdgeIt, e, g) {
+      if (cut[g.tail(e)] && !cut[g.head(e)] && !flow[e]==cap[e]) 
+	std::cout << "Slackness does not hold!" << std::endl;
+      if (!cut[g.tail(e)] && cut[g.head(e)] && flow[e]>0) 
+	std::cout << "Slackness does not hold!" << std::endl;
+    }
+  }
 
   {
     std::cout << "on-the-fly shortest path augmentation ..." << std::endl;