diff --git a/sexpr.parser b/sexpr.parser
index 5ac70c8..49d77c1 100644
--- a/sexpr.parser
+++ b/sexpr.parser
@@ -1,9 +1,8 @@
-ws:alias         = [ \b\f\n\r\t\v];
-comment:alias    = ";" [^\n]*;
-wsc:alias        = ws | comment;
-number           = "-"? ("0" | [1-9][0-9]*) ("." [0-9]+)? ([eE] [+\-]? [0-9]+)?;
-string           = "\"" ([^\\"] | "\\" .)* "\"";
-symbol           = ([^\\ \n\t\b\f\r\v\"()] | "\\" .)+;
-list             = "(" wsc* (expression wsc*)* ")";
+whitespace:ws    = [ \b\f\n\r\t\v];
+comment:alias:ws = ";" [^\n]*;
+number:nows      = "-"? ("0" | [1-9][0-9]*) ("." [0-9]+)? ([eE] [+\-]? [0-9]+)?;
+string:nows      = "\"" ([^\\"] | "\\" .)* "\"";
+symbol:nows      = ([^\\ \n\t\b\f\r\v\"()] | "\\" .)+;
+list             = "(" expression* ")";
 expression:alias = number | string | symbol | list;
 s-expression     = expression;