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+# 第1章の文法
+
+[English](01-grammar.md) | 日本語
+
+この文書は [第1章の文法定義](01-grammar.md) の日本語版です。文法定義そのものは原文と同一です。
+
+[第1章:導入に戻る](README.ja.md)
+
+```antlrv4
+grammar SimpleLanguage;
+
+program
+ : statement EOF
+ ;
+
+statement
+ : 'return' expression ';'
+ ;
+
+expression
+ : primaryExpression
+ ;
+
+primaryExpression
+ : INTEGER_LITERAL
+ ;
+
+INTEGER_LITERAL
+ : [1-9][0-9]*
+ | [0]
+ ;
+```