added trees serialization examples

REDUCE-TREES.txt

@@ -191,6 +191,7 @@ w is max leaves on same level, and h is height (distance from root to lowest lea
    / \
 
  width=2, height=1
+ serialization: 100
 
 3 leaves (1, Catalan=2):
     o
@@ -199,6 +200,7 @@ w is max leaves on same level, and h is height (distance from root to lowest lea
      / \
 
  w=2, h=2
+serial: 10100
 
 4 leaves (2, Catalan=5):
     o                  o
@@ -209,6 +211,7 @@ w is max leaves on same level, and h is height (distance from root to lowest lea
        / \
 
   w=2, h=3          w=4, h=2
+  serial: 1010100   serial: 1100100
 
 5 leaves (3, Catalan=14):
 
@@ -222,6 +225,7 @@ w is max leaves on same level, and h is height (distance from root to lowest lea
           / \
 
  w=2, h=4           w=3, h=3             w=4, h=3
+ serial: 101010100  serial: 110010100    serial: 101100100
 
 6 leaves (6, Catalan=42):
 
@@ -237,6 +241,7 @@ w is max leaves on same level, and h is height (distance from root to lowest lea
             / \
 
   w=2, h=5             w=3, h=4             w=3, h=4             w=4, h=4
+  serial: 10101010100  serial: 11001010100  serial: 10110010100  serial: 10101100100
 
 
       o                     o
@@ -247,3 +252,4 @@ w is max leaves on same level, and h is height (distance from root to lowest lea
       / \ / \             / \   / \
 
  w=4, h=3               w=4, h=3
+ serial: 11001100100    serial: 11010010100