diff --git a/src/main.rs b/src/main.rs
index aa03f81..227458a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 use fapprox::learner::Learner;
 
 mod formula;
+mod learner;
 mod node;
 #[cfg(test)]
 mod tests;
@@ -12,7 +13,7 @@ fn main() {
         None,
         Some(10000),
     );
-    let formula = learner.calculate_formula();
+    let formula = learner.calculate_formula_debug();
     println!("{:?}", formula.as_text());
     formula.display_tree();
 }