diff --git a/converter.py b/converter.py
index bee457a..4b2f6d0 100644
--- a/converter.py
+++ b/converter.py
@@ -18,22 +18,22 @@ class System:
         substitutions: list[tuple[str, str]],
         interpretations: list[tuple[str, str]],
     ):
-        self.name = name
+        self.name = name.strip()
         """System name"""
 
-        self.base = base
+        self.base = map(str.strip, base)
         """Set used"""
 
-        self.axiom = axiom
+        self.axiom = axiom.strip()
         """Axiom used at the start of iterations"""
 
-        self.substitutions = substitutions
+        self.substitutions = [(m.strip(), s.strip()) for m, s in substitutions]
         """
         Substitution for each member of the base,
         represented as a couple (member, substitution)
         """
 
-        self.interpretations = interpretations
+        self.interpretations = [(m.strip(), i.strip()) for m, i in interpretations]
         """
         Interpretation for each member of the base,
         represented as a couple (member, interpretation)