diff --git a/examples/yaml_gen/config.yaml b/examples/yaml_gen/config.yaml
index 910b637..5484686 100644
--- a/examples/yaml_gen/config.yaml
+++ b/examples/yaml_gen/config.yaml
@@ -1,8 +1,8 @@
-root-type:              seq
+root-type:              map
 documents:              2
 complex-keys:           false
 collection-keys:        false
-min-nodes-per-document: 65536 
+min-nodes-per-document: 4096
 encoding:               utf-8
 indent:                 4
 text-width:             40
@@ -11,7 +11,8 @@ text-width:             40
 #we end up with extremely deeply nested structures
 
 string: 
-    probability: 10 
+    probability: 20
+    alphabet: " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789ábćčďéěǵǧȟíǐǰḱǩĺľḿńňóǒôäṕŕřśšť"
     range: {min: 1, max: 40, dist: cubic}
 int: 
     probability: 10 
diff --git a/examples/yaml_gen/yaml_gen.d b/examples/yaml_gen/yaml_gen.d
index 68eb21c..96be25a 100644
--- a/examples/yaml_gen/yaml_gen.d
+++ b/examples/yaml_gen/yaml_gen.d
@@ -1,6 +1,7 @@
 
 ///Random YAML generator. Used to generate benchmarking inputs.
 
+import std.algorithm;
 import std.conv;
 import std.datetime;
 import std.math;
@@ -10,9 +11,6 @@ import std.string;
 import dyaml.all;
 
 
-immutable alphabet = " abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_";
-immutable digits   = "0123456789";
-
 Node config;
 Node function(bool)[string] generators;
 auto typesScalar     = ["string", "int", "float", "bool", "timestamp", "binary"];
@@ -65,7 +63,7 @@ real randomReal(const real min, const real max, const string distribution = "lin
     return min + (max - min) * randomNormalized(distribution);
 }
 
-char randomChar(const string chars)
+dchar randomChar(const dstring chars)
 {
     return chars[randomLong(0, chars.length - 1)];
 }
@@ -84,17 +82,19 @@ Node genString(bool root = false)
 {
     auto range = config["string"]["range"];
 
+    auto alphabet = config["string"]["alphabet"].as!dstring;
+
     const chars = randomLong(range["min"].as!uint, range["max"].as!uint,
                              range["dist"].as!string);
 
-    char[] result = new char[chars];
+    dchar[] result = new dchar[chars];
     result[0] = randomChar(alphabet);
     foreach(i; 1 .. chars)
     {
-        result[i] = randomChar(alphabet ~ digits);
+        result[i] = randomChar(alphabet);
     }
 
-    return Node(cast(string)result);
+    return Node(result.to!string);
 }
 
 Node genInt(bool root = false)