diff --git a/Makefile b/Makefile
index bd6a80f..b282ade 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,10 @@
 all:
+
+ssuinstall:
+
+	ssu install -m 644 thesaurus.py thesauruscfg.py /usr/local/lib/python2.7/dist-packages/
+	ssu install -m 644 thesaurus.py thesauruscfg.py /usr/local/lib/python3.6/dist-packages/
+	ssu install -m 644 thesaurus.py thesauruscfg.py /usr/local/lib/python3.8/site-packages/
 
 clean:
 	-rm *.pyc *.pyo
diff --git a/thesaurus.py b/thesaurus.py
index 37ecf42..5ef847e 100644
--- a/thesaurus.py
+++ b/thesaurus.py
@@ -17,7 +17,7 @@
 ###
 from __future__ import print_function
 
-__VERSION__ = (2, 9, 0, 20191110)
+__VERSION__ = (2, 9, 1, 20220619)
 
 from sys import version_info, getrecursionlimit
 __PYTHON_ORDERED__ = version_info[0:2] >= (3,6)	# cPython 3,6+ has ordered keys built in.
@@ -228,9 +228,8 @@
 	def items (self):
 		return list( (key, self[key]) for key in self.__keyorder )
 	def clear (self):
-		for key in self.__keyorder:
+		for key in self.__keyorder[::-1]:
 			del self[key]
-		del self.__keyorder[:]
 	def __iter__ (self):
 		return self.iterkeys()
 	def iterkeys (self):
@@ -366,7 +365,19 @@
 		if isinstance (key, int) or isinstance (key, slice):
 			return list(self.values())[key]
 		return thes.__getitem__(self, key)
-
+	def keys (self, exclude=None):
+		if exclude == None:
+			return thes.keys(self)
+		if isinstance(exclude, str):
+			exclude = (exclude,)
+		return [ _key for _key in thes.keys(self) if _key not in exclude ]
+	def items (self, exclude=None):
+		if exclude == None:
+			return thes.items(self)
+		if isinstance(exclude, str):
+			exclude = (exclude,)
+		return [ (_key,_value) for _key,_value in thes.items(self) if _key not in exclude ]
+		
 thesext = ThesaurusExtended