diff --git a/CMakeLists.txt b/CMakeLists.txt
index e09c673..9854000 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.25)
-project(blt-gp VERSION 0.0.6)
+project(blt-gp VERSION 0.0.7)
 
 option(ENABLE_ADDRSAN "Enable the address sanitizer" OFF)
 option(ENABLE_UBSAN "Enable the ub sanitizer" OFF)
diff --git a/examples/main.cpp b/examples/main.cpp
index 56da706..a501c71 100644
--- a/examples/main.cpp
+++ b/examples/main.cpp
@@ -17,11 +17,266 @@
  */
 #include <iostream>
 #include <blt/gp/program.h>
+#include <variant>
+#include <stack>
+#include <deque>
+#include <vector>
+#include <random>
+
+// small scale
+enum class op
+{
+    ADD,
+    SUB,
+    MUL,
+    DIV,
+    LIT
+};
+
+std::string to_string(op o)
+{
+    switch (o)
+    {
+        case op::ADD:
+            return "ADD";
+        case op::SUB:
+            return "SUB";
+        case op::MUL:
+            return "MUL";
+        case op::DIV:
+            return "DIV";
+        case op::LIT:
+            return "LIT";
+    }
+    return "";
+}
+
+constexpr static long SEED = 41912;
+
+op generate_op()
+{
+    static std::mt19937_64 engine(SEED);
+    static std::uniform_int_distribution dist(0, static_cast<int>(op::LIT) - 1);
+    return static_cast<op>(dist(engine));
+}
+
+bool choice()
+{
+    static std::mt19937_64 engine(SEED);
+    static std::uniform_int_distribution dist(0, 1);
+    return dist(engine);
+}
+
+float random_value()
+{
+    static std::mt19937_64 engine(SEED);
+    static std::uniform_real_distribution dist(0.0f, 10.0f);
+    return dist(engine);
+}
+
+void test()
+{
+    std::vector<op> operations;
+    std::vector<float> values;
+    
+    std::stack<op> tree_generator;
+    tree_generator.push(generate_op());
+    
+    while (!tree_generator.empty())
+    {
+        auto opn = tree_generator.top();
+        tree_generator.pop();
+        
+        operations.push_back(opn);
+        if (opn == op::LIT)
+        {
+            values.push_back(random_value());
+            continue;
+        }
+        
+        // child 1
+        if (choice())
+            tree_generator.push(generate_op());
+        else
+            tree_generator.push(op::LIT);
+        
+        // child 2
+        if (choice())
+            tree_generator.push(generate_op());
+        else
+            tree_generator.push(op::LIT);
+    }
+    
+    for (const auto& v : operations)
+        std::cout << to_string(v) << " ";
+    std::cout << std::endl;
+    
+    {
+        std::stack<blt::size_t> process;
+        for (const auto& v : operations)
+        {
+            switch (v)
+            {
+                case op::ADD:
+                case op::SUB:
+                case op::MUL:
+                case op::DIV:
+                    process.emplace(2);
+                    std::cout << "(";
+                    break;
+                case op::LIT:
+                    break;
+            }
+            std::cout << to_string(v);
+            while (!process.empty())
+            {
+                auto top = process.top();
+                process.pop();
+                if (top == 0)
+                {
+                    std::cout << ")";
+                    continue;
+                } else
+                {
+                    std::cout << " ";
+                    process.push(top - 1);
+                    break;
+                }
+            }
+        }
+        while (!process.empty())
+        {
+            auto top = process.top();
+            process.pop();
+            if (top == 0)
+            {
+                std::cout << ") ";
+                continue;
+            } else
+            {
+                std::cerr << "FUCK YOU\n";
+                break;
+            }
+        }
+        std::cout << std::endl;
+    }
+    
+    for (const auto& v : values)
+        std::cout << v << " ";
+    std::cout << std::endl;
+    
+    {
+        std::stack<blt::size_t> process;
+        blt::size_t index = 0;
+        for (const auto& v : operations)
+        {
+            switch (v)
+            {
+                case op::ADD:
+                case op::SUB:
+                case op::MUL:
+                case op::DIV:
+                    process.emplace(2);
+                    std::cout << "(";
+                    std::cout << to_string(v);
+                    break;
+                case op::LIT:
+                    std::cout << values[index++];
+                    break;
+            }
+            
+            while (!process.empty())
+            {
+                auto top = process.top();
+                process.pop();
+                if (top == 0)
+                {
+                    std::cout << ")";
+                    continue;
+                } else
+                {
+                    std::cout << " ";
+                    process.push(top - 1);
+                    break;
+                }
+            }
+        }
+        while (!process.empty())
+        {
+            auto top = process.top();
+            process.pop();
+            if (top == 0)
+            {
+                std::cout << ") ";
+                continue;
+            } else
+            {
+                std::cerr << "FUCK YOU\n";
+                break;
+            }
+        }
+        std::cout << std::endl;
+    }
+    
+    std::stack<float> process;
+    std::stack<op> operators;
+    
+    for (const auto& v : operations)
+        operators.push(v);
+    
+    while (!operators.empty())
+    {
+        auto oper = operators.top();
+        operators.pop();
+        if (oper == op::LIT)
+        {
+            process.push(values.back());
+            values.pop_back();
+        } else
+        {
+            auto v1 = process.top();
+            process.pop();
+            auto v2 = process.top();
+            process.pop();
+            std::cout << "processing oper " << to_string(oper) << " with values " << v1 << " " << v2 << std::endl;
+            switch (oper)
+            {
+                case op::ADD:
+                    values.push_back(v1 + v2);
+                    operators.push(op::LIT);
+                    break;
+                case op::SUB:
+                    values.push_back(v1 - v2);
+                    operators.push(op::LIT);
+                    break;
+                case op::MUL:
+                    values.push_back(v1 * v2);
+                    operators.push(op::LIT);
+                    break;
+                case op::DIV:
+                    if (v2 == 0)
+                        v2 = 1;
+                    values.push_back(v1 / v2);
+                    operators.push(op::LIT);
+                    break;
+                case op::LIT:
+                    break;
+            }
+            std::cout << "\tresult: " << values.back() << std::endl;
+        }
+    }
+    
+    std::cout << process.size() << std::endl;
+    std::cout << process.top() << std::endl;
+    
+}
 
 int main()
 {
+    test();
+    
     blt::gp::operation<float, float, int, bool> silly([](float f, int i, bool b) -> float {
-        return static_cast<float>(b);
+        return static_cast<float>(f);
     });
     
     float f = 10.5;