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diff --git a/pygments/lexers/grammar_notation.py b/pygments/lexers/grammar_notation.py
deleted file mode 100644
index 66d3eb36..00000000
--- a/pygments/lexers/grammar_notation.py
+++ /dev/null
@@ -1,213 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    pygments.lexers.grammar_notation
-    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-    Lexers for grammer notations like BNF.
-
-    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-
-import re
-
-from pygments.lexer import RegexLexer, bygroups, include, this, using, words
-from pygments.token import Comment, Keyword, Literal, Name, Number, \
-    Operator, Punctuation, String, Text
-
-__all__ = ['BnfLexer', 'AbnfLexer', 'JsgfLexer']
-
-
-class BnfLexer(RegexLexer):
-    """
-    This lexer is for grammer notations which are similar to
-    original BNF.
-
-    In order to maximize a number of targets of this lexer,
-    let's decide some designs:
-
-    * We don't distinguish `Terminal Symbol`.
-
-    * We do assume that `NonTerminal Symbol` are always enclosed
-      with arrow brackets.
-
-    * We do assume that `NonTerminal Symbol` may include
-      any printable characters except arrow brackets and ASCII 0x20.
-      This assumption is for `RBNF <http://www.rfc-base.org/txt/rfc-5511.txt>`_.
-
-    * We do assume that target notation doesn't support comment.
-
-    * We don't distinguish any operators and punctuation except
-      `::=`.
-
-    Though these desision making might cause too minimal highlighting
-    and you might be disappointed, but it is reasonable for us.
-
-    .. versionadded:: 2.1
-    """
-
-    name = 'BNF'
-    aliases = ['bnf']
-    filenames = ['*.bnf']
-    mimetypes = ['text/x-bnf']
-
-    tokens = {
-        'root': [
-            (r'(<)([ -;=?-~]+)(>)',
-             bygroups(Punctuation, Name.Class, Punctuation)),
-
-            # an only operator
-            (r'::=', Operator),
-
-            # fallback
-            (r'[^<>:]+', Text),  # for performance
-            (r'.', Text),
-        ],
-    }
-
-
-class AbnfLexer(RegexLexer):
-    """
-    Lexer for `IETF 7405 ABNF
-    <http://www.ietf.org/rfc/rfc7405.txt>`_
-    (Updates `5234 <http://www.ietf.org/rfc/rfc5234.txt>`_)
-    grammars.
-
-    .. versionadded:: 2.1
-    """
-
-    name = 'ABNF'
-    aliases = ['abnf']
-    filenames = ['*.abnf']
-    mimetypes = ['text/x-abnf']
-
-    _core_rules = (
-        'ALPHA', 'BIT', 'CHAR', 'CR', 'CRLF', 'CTL', 'DIGIT',
-        'DQUOTE', 'HEXDIG', 'HTAB', 'LF', 'LWSP', 'OCTET',
-        'SP', 'VCHAR', 'WSP')
-
-    tokens = {
-        'root': [
-            # comment
-            (r';.*$', Comment.Single),
-
-            # quoted
-            #   double quote itself in this state, it is as '%x22'.
-            (r'(%[si])?"[^"]*"', Literal),
-
-            # binary (but i have never seen...)
-            (r'%b[01]+\-[01]+\b', Literal),  # range
-            (r'%b[01]+(\.[01]+)*\b', Literal),  # concat
-
-            # decimal
-            (r'%d[0-9]+\-[0-9]+\b', Literal),  # range
-            (r'%d[0-9]+(\.[0-9]+)*\b', Literal),  # concat
-
-            # hexadecimal
-            (r'%x[0-9a-fA-F]+\-[0-9a-fA-F]+\b', Literal),  # range
-            (r'%x[0-9a-fA-F]+(\.[0-9a-fA-F]+)*\b', Literal),  # concat
-
-            # repetition (<a>*<b>element) including nRule
-            (r'\b[0-9]+\*[0-9]+', Operator),
-            (r'\b[0-9]+\*', Operator),
-            (r'\b[0-9]+', Operator),
-            (r'\*', Operator),
-
-            # Strictly speaking, these are not keyword but
-            # are called `Core Rule'.
-            (words(_core_rules, suffix=r'\b'), Keyword),
-
-            # nonterminals (ALPHA *(ALPHA / DIGIT / "-"))
-            (r'[a-zA-Z][a-zA-Z0-9-]+\b', Name.Class),
-
-            # operators
-            (r'(=/|=|/)', Operator),
-
-            # punctuation
-            (r'[\[\]()]', Punctuation),
-
-            # fallback
-            (r'\s+', Text),
-            (r'.', Text),
-        ],
-    }
-
-
-class JsgfLexer(RegexLexer):
-    """
-    For `JSpeech Grammar Format <https://www.w3.org/TR/jsgf/>`_
-    grammars.
-
-    .. versionadded:: 2.2
-    """
-    name = 'JSGF'
-    aliases = ['jsgf']
-    filenames = ['*.jsgf']
-    mimetypes = ['application/jsgf', 'application/x-jsgf', 'text/jsgf']
-
-    flags = re.MULTILINE | re.UNICODE
-
-    tokens = {
-        'root': [
-            include('comments'),
-            include('non-comments'),
-        ],
-        'comments': [
-            (r'/\*\*(?!/)', Comment.Multiline, 'documentation comment'),
-            (r'/\*[\w\W]*?\*/', Comment.Multiline),
-            (r'//.*', Comment.Single),
-        ],
-        'non-comments': [
-            (r'\A#JSGF[^;]*', Comment.Preproc),
-            (r'\s+', Text),
-            (r';', Punctuation),
-            (r'[=|()\[\]*+]', Operator),
-            (r'/[^/]+/', Number.Float),
-            (r'"', String.Double, 'string'),
-            (r'\{', String.Other, 'tag'),
-            (words(('import', 'public'), suffix=r'\b'), Keyword.Reserved),
-            (r'grammar\b', Keyword.Reserved, 'grammar name'),
-            (r'(<)(NULL|VOID)(>)',
-             bygroups(Punctuation, Name.Builtin, Punctuation)),
-            (r'<', Punctuation, 'rulename'),
-            (r'\w+|[^\s;=|()\[\]*+/"{<\w]+', Text),
-        ],
-        'string': [
-            (r'"', String.Double, '#pop'),
-            (r'\\.', String.Escape),
-            (r'[^\\"]+', String.Double),
-        ],
-        'tag': [
-            (r'\}', String.Other, '#pop'),
-            (r'\\.', String.Escape),
-            (r'[^\\}]+', String.Other),
-        ],
-        'grammar name': [
-            (r';', Punctuation, '#pop'),
-            (r'\s+', Text),
-            (r'\.', Punctuation),
-            (r'[^;\s.]+', Name.Namespace),
-        ],
-        'rulename': [
-            (r'>', Punctuation, '#pop'),
-            (r'\*', Punctuation),
-            (r'\s+', Text),
-            (r'([^.>]+)(\s*)(\.)', bygroups(Name.Namespace, Text, Punctuation)),
-            (r'[^.>]+', Name.Constant),
-        ],
-        'documentation comment': [
-            (r'\*/', Comment.Multiline, '#pop'),
-            (r'(^\s*\*?\s*)(@(?:example|see)\s+)'
-             r'([\w\W]*?(?=(?:^\s*\*?\s*@|\*/)))',
-             bygroups(Comment.Multiline, Comment.Special,
-                      using(this, state='example'))),
-            (r'(^\s*\*?\s*)(@\S*)',
-             bygroups(Comment.Multiline, Comment.Special)),
-            (r'[^*\n@]+|\w|\W', Comment.Multiline),
-        ],
-        'example': [
-            (r'\n\s*\*', Comment.Multiline),
-            include('non-comments'),
-            (r'.', Comment.Multiline),
-        ],
-    }