gf-book web page index and toc

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diff --git a/gf-book/examples/chapter3/FoodsEng.gf b/gf-book/examples/chapter3/FoodsEng.gf
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+concrete FoodsEng of Foods = {
+  lincat
+    Comment, Quality = {s : Str} ; 
+    Kind = {s : Number => Str} ; 
+    Item = {s : Str ; n : Number} ; 
+  lin
+    Pred item quality = 
+      {s = item.s ++ copula ! item.n ++ quality.s} ;
+    This  = det Sg "this" ;
+    That  = det Sg "that" ;
+    These = det Pl "these" ;
+    Those = det Pl "those" ;
+    Mod quality kind = 
+      {s = \\n => quality.s ++ kind.s ! n} ;
+    Wine = regNoun "wine" ;
+    Cheese = regNoun "cheese" ;
+    Fish = noun "fish" "fish" ;
+    Pizza = regNoun "pizza" ;
+    Very a = {s = "very" ++ a.s} ;
+    Fresh = adj "fresh" ;
+    Warm = adj "warm" ;
+    Italian = adj "Italian" ;
+    Expensive = adj "expensive" ;
+    Delicious = adj "delicious" ;
+    Boring = adj "boring" ;
+  param
+    Number = Sg | Pl ;
+  oper
+    det : Number -> Str -> 
+      {s : Number => Str} -> {s : Str ; n : Number} = 
+        \n,det,noun -> {s = det ++ noun.s ! n ; n = n} ;
+    noun : Str -> Str -> {s : Number => Str} = 
+      \man,men -> {s = table {Sg => man ; Pl => men}} ;
+    regNoun : Str -> {s : Number => Str} = 
+      \car -> noun car (car + "s") ;
+    adj : Str -> {s : Str} = 
+      \cold -> {s = cold} ;
+    copula : Number => Str = 
+      table {Sg => "is" ; Pl => "are"} ;
+}