2 files changed, 0 insertions, 199 deletions
diff --git a/chapter09/docs/09-grammar.ja.md b/chapter09/docs/09-grammar.ja.md
deleted file mode 100644
index f89b449b..00000000
--- a/chapter09/docs/09-grammar.ja.md
+++ /dev/null
@@ -1,103 +0,0 @@
-# 第9章の文法
-
-[English](09-grammar.md) | 日本語
-
-この文書は [原文](09-grammar.md) の日本語訳です。
-
-> 訳注: 原文の見出しは「Grammar for Chapter 8」ですが、このファイルは第9章に属するため、訳の見出しは第9章としています。文法は原文のまま保持しています。
-
-
-[第9章に戻る](../README.ja.md)
-
-```antlrv4
-grammar SimpleLanguage;
-
-program
-    : statement+ EOF
-    ;
-
-statement
-    : returnStatement
-    | declStatement
-    | blockStatment
-    | expressionStatement
-    | ifStatement
-    | whileStatement
-    | breakStatement
-    | continueStatment
-    ;
-
-whileStatement
-    : 'while' '(' expression ')' statement
-    ;
-
-breakStatement
-    : 'break' ';'
-    ;
-
-continueStatement
-    : 'continue' ';'
-    ;
-
-ifStatement
-    : 'if' '(' expression ')' statement ('else' statement)?
-    ;
-
-
-expressionStatement
-    : IDENTIFIER '=' expression ';'
-    ;
-
-blockStatement
-    : '{' statement+ '}'
-    ;
-
-declStatement
-    : 'int' IDENTIFIER '=' expression ';'
-    ;
-
-returnStatement
-    : 'return' expression ';'
-    ;
-
-expression
-    : comparisonExpression
-    ;
-
-comparisonExpression
-    : additiveExpression (('==' | '!='| '>'| '<'| '>='| '<=') additiveExpression)*
-    ;
-
-additiveExpression
-    : multiplicativeExpression (('+' | '-') multiplicativeExpression)*
-    ;
-
-multiplicativeExpression
-    : unaryExpression (('*' | '/') unaryExpression)*
-    ;
-
-unaryExpression
-    : ('-') unaryExpression
-    | primaryExpression
-    ;
-
-primaryExpression
-    : IDENTIFIER
-    | INTEGER_LITERAL
-    | 'true'
-    | 'false'
-    | '(' expression ')'
-    ;
-
-INTEGER_LITERAL
-    : [1-9][0-9]*
-    | [0]
-    ;
-
-IDENTIFIER
-    : NON_DIGIT (NON_DIGIT | DIGIT)*
-    ;
-
-NON_DIGIT: [a-zA-Z_];
-DEC_DIGIT: [0-9];
-```
diff --git a/chapter09/docs/09-grammar.md b/chapter09/docs/09-grammar.md
deleted file mode 100644
index 5f6d5209..00000000
--- a/chapter09/docs/09-grammar.md
+++ /dev/null
@@ -1,96 +0,0 @@
-# Grammar for Chapter 8
-
-English | [日本語](09-grammar.ja.md)
-
-```antlrv4
-grammar SimpleLanguage;
-
-program
-    : statement+ EOF
-    ;
-
-statement
-    : returnStatement
-    | declStatement
-    | blockStatment
-    | expressionStatement
-    | ifStatement
-    | whileStatement
-    | breakStatement
-    | continueStatment
-    ;
-
-whileStatement
-    : 'while' '(' expression ')' statement
-    ;
-
-breakStatement
-    : 'break' ';'
-    ;
-
-continueStatement
-    : 'continue' ';'
-    ;
-
-ifStatement
-    : 'if' '(' expression ')' statement ('else' statement)?
-    ;
-
-
-expressionStatement
-    : IDENTIFIER '=' expression ';'
-    ;
-
-blockStatement
-    : '{' statement+ '}'
-    ;
-
-declStatement
-    : 'int' IDENTIFIER '=' expression ';'
-    ;
-
-returnStatement
-    : 'return' expression ';'
-    ;
-
-expression
-    : comparisonExpression
-    ;
-
-comparisonExpression
-    : additiveExpression (('==' | '!='| '>'| '<'| '>='| '<=') additiveExpression)*
-    ;
-
-additiveExpression
-    : multiplicativeExpression (('+' | '-') multiplicativeExpression)*
-    ;
-
-multiplicativeExpression
-    : unaryExpression (('*' | '/') unaryExpression)*
-    ;
-
-unaryExpression
-    : ('-') unaryExpression
-    | primaryExpression
-    ;
-
-primaryExpression
-    : IDENTIFIER
-    | INTEGER_LITERAL
-    | 'true'
-    | 'false'
-    | '(' expression ')'
-    ;
-
-INTEGER_LITERAL
-    : [1-9][0-9]*
-    | [0]
-    ;
-
-IDENTIFIER
-    : NON_DIGIT (NON_DIGIT | DIGIT)*
-    ;
-
-NON_DIGIT: [a-zA-Z_];
-DEC_DIGIT: [0-9];
-```