diff --git a/exampleConfig.yaml b/exampleConfig.yaml
index dd51aa6..8c3042b 100644
--- a/exampleConfig.yaml
+++ b/exampleConfig.yaml
@@ -3,34 +3,15 @@ labels:
   - label: "AgentIsInGoal"
     text: "AgentIsInGoal"
 
-constants:
-  - constant: "prop_slippery_turn"
-    type: "double"
-    value: "9/9"
-    overwrite: True
-  - constant: "prop_next_neighbour_turn"
-    type: "double"
-    value: "0/9"
-    overwrite: True
-  - constant: "prop_slippery_move_forward"
-    type: "double"
-    value: "3/4"
-    overwrite: True
-  - constant: "prop_direct_neighbour"
-    type: "double"
-    value: "1/4"  
-  - constant: "prop_next_neighbour"
-    type: "double"
-    value: "1/8"
-    overwrite: True
-  - constant: "total_prop"
-    type: "double"
-    value: "4"
-    overwrite: True
+# constants:
+#   - constant: "prop_slippery_turn"
+#     type: "double"
+#     value: "9/9"
+#     overwrite: True
 
 probabilities:
   - probability: "FaultProbability"
-    value: 0.1
+    value: 0.2
   - probability: "ProbForwardIntended"
     value: 0.1
   - probability: "ProbTurnIntended"
@@ -43,13 +24,10 @@ modules:
         guard: "AgentIsOnSlippery"
         update: "True"
         overwrite: True
-
-...
-
-const double prop_zero = 0/9;
-const double prop_next_neighbour = 1/9;
-const double prop_slippery_move_forward = 7/9;
-const double prop_slippery_turn = 6/9;
-const double prop_next_neighbour_turn = 1/9;
-const double prop_direct_neighbour = 2/9;
-const double total_prop = 9;
\ No newline at end of file
+        index: 3
+      - action: "[Agent_turn_right]"
+        guard: "AgentIsOnSlippery"
+        update: "True"
+        overwrite: True
+        index: [0,1]
+...
\ No newline at end of file
diff --git a/main.cpp b/main.cpp
index e41ac3a..2760259 100644
--- a/main.cpp
+++ b/main.cpp
@@ -166,7 +166,7 @@ int main(int argc, char* argv[]) {
     if(ok) {
       Grid grid(contentCells, backgroundCells, gridOptions, stateRewards, probIntended, faultyProbability);
 
-      grid.printToPrism(std::cout, configurations , gridOptions.getModelType());
+      // grid.printToPrism(std::cout, configurations , gridOptions.getModelType());
       std::stringstream ss;
       // grid.printToPrism(file, configurations ,prism::ModelType::MDP);
       grid.printToPrism(ss, configurations , gridOptions.getModelType());
diff --git a/util/ConfigYaml.cpp b/util/ConfigYaml.cpp
index 7dc392c..57226d0 100644
--- a/util/ConfigYaml.cpp
+++ b/util/ConfigYaml.cpp
@@ -103,7 +103,12 @@ bool YAML::convert<Command>::decode(const YAML::Node& node, Command& rhs) {
         rhs.overwrite_ = node["overwrite"].as<bool>();
     }
     if (node["index"]) {
-        rhs.index_ = node["index"].as<int>();
+        try {
+            rhs.index_ = node["index"].as<std::vector<int>>();
+        }
+        catch(const std::exception& e) {
+            rhs.index_ = {node["index"].as<int>()};
+        }   
     }
 
     return true;
@@ -251,7 +256,7 @@ YamlConfigParseResult YamlConfigParser::parseConfiguration() {
             for (auto& constant : constants) {
                 // std::cout << constant.constant_ << std::endl;
                 configuration.push_back({constant.createExpression(), "const " + constant.type_ + " " + constant.constant_, ConfigType::Constant, constant.overwrite_});
-            }
+            }            
         }
         catch(const std::exception& e) {
             std::cout << "Exception '" << typeid(e).name() << "' caught:" << std::endl;
diff --git a/util/ConfigYaml.h b/util/ConfigYaml.h
index ccaa34c..bfdbc44 100644
--- a/util/ConfigYaml.h
+++ b/util/ConfigYaml.h
@@ -22,7 +22,7 @@ struct Configuration
   std::string module_ {};
   std::string expression_{};
   std::string identifier_{};
-  int index_{};
+  std::vector<int> index_{0};
 
   ConfigType type_ {ConfigType::Label};
   bool overwrite_ {false};
@@ -33,7 +33,7 @@ struct Configuration
                 , ConfigType type
                 , bool overwrite = false
                 , std::string module = ""
-                , int index = 0) : expression_(expression), identifier_(identifier), type_(type), overwrite_(overwrite), module_{module}, index_(index) {}
+                , std::vector<int> index = {0}) : expression_(expression), identifier_(identifier), type_(type), overwrite_(overwrite), module_{module}, index_(index) {}
   
   ~Configuration() = default;
   Configuration(const Configuration&) = default;
@@ -100,7 +100,7 @@ struct Command {
   std::string action_;
   std::string guard_;
   std::string update_;
-  int index_{0};
+  std::vector<int> index_{0};
   bool overwrite_ {false};
 
   std::string createExpression() const;
diff --git a/util/Grid.cpp b/util/Grid.cpp
index 294ddd1..ac22546 100644
--- a/util/Grid.cpp
+++ b/util/Grid.cpp
@@ -104,29 +104,30 @@ void Grid::applyOverwrites(std::string& str, std::vector<Configuration>& configu
     if (!config.overwrite_) {
       continue;
     }
-      size_t start_pos;
-
-      if (config.type_ == ConfigType::Formula) {
-        start_pos = str.find("formula " + config.identifier_);
-      } else if (config.type_ == ConfigType::Label) {
-        start_pos = str.find("label " + config.identifier_);
-      } else if (config.type_ == ConfigType::Module) {
-        auto iter = boost::find_nth(str, config.identifier_, config.index_);
+      for (auto& index : config.index_) {
+        size_t start_pos;
+        std::string search;      
+
+        if (config.type_ == ConfigType::Formula) {
+          search = "formula " + config.identifier_;
+        } else if (config.type_ == ConfigType::Label) {
+          search = "label " + config.identifier_;
+        } else if (config.type_ == ConfigType::Module) {
+          search = config.identifier_;
+        }
+        else if (config.type_ == ConfigType::Constant) {
+          search = config.identifier_;
+        }
+
+        auto iter = boost::find_nth(str, search, index);
         start_pos = std::distance(str.begin(), iter.begin());
-      }
-       else if (config.type_ == ConfigType::Constant) {
-        start_pos = str.find(config.identifier_);
+        size_t end_pos = str.find(';', start_pos) + 1;
 
-        if (start_pos == std::string::npos) {
-          std::cout << "Couldn't find overwrite:" << config.expression_ << std::endl;
+        if (end_pos != std::string::npos && end_pos != 0) {
+          std::string expression = config.expression_;
+          str.replace(start_pos, end_pos - start_pos , expression);
         }
       }
-
-      size_t end_pos = str.find(';', start_pos) + 1;
-
-      std::string expression = config.expression_;
-
-      str.replace(start_pos, end_pos - start_pos , expression);
   }
 }
 void Grid::printToPrism(std::ostream& os, std::vector<Configuration>& configuration ,const prism::ModelType& modelType) {