diff --git a/parso/python/grammar27.txt b/parso/python/grammar27.txt
index 515dea6..8101078 100644
--- a/parso/python/grammar27.txt
+++ b/parso/python/grammar27.txt
@@ -24,19 +24,12 @@ decorator: '@' dotted_name [ '(' [arglist] ')' ] NEWLINE
 decorators: decorator+
 decorated: decorators (classdef | funcdef)
 funcdef: 'def' NAME parameters ['->' test] ':' suite
-parameters: '(' [typedargslist] ')'
-typedargslist: ((tfpdef ['=' test] ',')*
-                ('*' [tname] (',' tname ['=' test])* [',' '**' tname] | '**' tname)
-                | tfpdef ['=' test] (',' tfpdef ['=' test])* [','])
-tname: NAME [':' test]
-tfpdef: tname | '(' tfplist ')'
-tfplist: tfpdef (',' tfpdef)* [',']
-varargslist: ((vfpdef ['=' test] ',')*
-              ('*' [vname] (',' vname ['=' test])*  [',' '**' vname] | '**' vname)
-              | vfpdef ['=' test] (',' vfpdef ['=' test])* [','])
-vname: NAME
-vfpdef: vname | '(' vfplist ')'
-vfplist: vfpdef (',' vfpdef)* [',']
+parameters: '(' [varargslist] ')'
+varargslist: ((fpdef ['=' test] ',')*
+              ('*' [NAME] (',' NAME ['=' test])*  [',' '**' NAME] | '**' NAME)
+              | fpdef ['=' test] (',' fpdef ['=' test])* [','])
+fpdef: NAME | '(' fplist ')'
+fplist: fpdef (',' fpdef)* [',']
 
 stmt: simple_stmt | compound_stmt
 simple_stmt: small_stmt (';' small_stmt)* [';'] NEWLINE