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diff --git a/parser/grammar.ebnf b/parser/grammar.ebnf
index ccfe6eb..2877e8f 100644
--- a/parser/grammar.ebnf
+++ b/parser/grammar.ebnf
@@ -57,12 +57,18 @@ name : /[A-Za-z
 
 ?and_word : "AND"
           | "and"
+          | "é"
+          | "É"
 
 ?or_word : "OR"
          | "or"
+         | "éìé"
+         | "ÉÌÉ"
 
 ?not_word : "NOT"
           | "not"
+          | "îå"
+          | "ÎÅ"
 
 %import common.WS
 %ignore WS