diff --git a/ir.py b/ir.py
index af8bab4..5efb405 100644
--- a/ir.py
+++ b/ir.py
@@ -17,7 +17,7 @@ class Subst:
 	def __str__(self) -> str:
 		return repr(self)
 	def __repr__(self) -> str:
-		return f'{self.variable}/{self.replacement}'
+		return f'{self.replacement}/{self.variable}'
 
 @dataclass(frozen=True)
 class IRProp: