diff --git a/MathKit/MPExpressionStorage.m b/MathKit/MPExpressionStorage.m
index d2995a9..5cd6201 100644
--- a/MathKit/MPExpressionStorage.m
+++ b/MathKit/MPExpressionStorage.m
@@ -15,16 +15,6 @@
 
 
 
-@interface MPExpressionStorage ()
-
-@property (nonatomic, strong) NSLayoutManager *layoutManager;
-@property (nonatomic, strong) NSTextContainer *textContainer;
-@property (nonatomic, strong) NSTextStorage *textStorage;
-
-@end
-
-
-
 @implementation MPExpressionStorage
 
 - (instancetype)initWithElements:(NSArray *)elements