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diff --git a/parser/grammar b/parser/grammar
index 7ded1c2..ade8b12 100644
--- a/parser/grammar
+++ b/parser/grammar
@@ -20,8 +20,13 @@ OR_OP : '|'
 
 NOT_OP : '!'
 
+SP0 : '[ \t]*'
+
+SP1 : '[ \t]+'
+
 expression : NAME
            | expression AND_OP expression
-           | NOT_OP expression
            | expression OR_OP expression
+           | NOT_OP expression
            | '(' expression ')'
+           | SP0 expression SP0