@@ -173,8 +173,8 @@ class TestDatetime64SeriesComparison:
173173                [NaT , NaT , Timedelta ("3 days" )], 
174174            ), 
175175            ( 
176-                 [Period ("2011-01" , freq = "M " ), NaT , Period ("2011-03" , freq = "M " )], 
177-                 [NaT , NaT , Period ("2011-03" , freq = "M " )], 
176+                 [Period ("2011-01" , freq = "ME " ), NaT , Period ("2011-03" , freq = "ME " )], 
177+                 [NaT , NaT , Period ("2011-03" , freq = "ME " )], 
178178            ), 
179179        ], 
180180    ) 
@@ -218,7 +218,7 @@ def test_nat_comparisons(
218218        [ 
219219            [Timestamp ("2011-01-01" ), NaT , Timestamp ("2011-01-03" )], 
220220            [Timedelta ("1 days" ), NaT , Timedelta ("3 days" )], 
221-             [Period ("2011-01" , freq = "M " ), NaT , Period ("2011-03" , freq = "M " )], 
221+             [Period ("2011-01" , freq = "ME " ), NaT , Period ("2011-03" , freq = "ME " )], 
222222        ], 
223223    ) 
224224    @pytest .mark .parametrize ("dtype" , [None , object ]) 
@@ -1078,7 +1078,7 @@ def test_dt64arr_add_dtlike_raises(self, tz_naive_fixture, box_with_array):
10781078    # Note: freq here includes both Tick and non-Tick offsets; this is 
10791079    #  relevant because historically integer-addition was allowed if we had 
10801080    #  a freq. 
1081-     @pytest .mark .parametrize ("freq" , ["H" , "D" , "W" , "M " , "MS" , "Q" , "B" , None ]) 
1081+     @pytest .mark .parametrize ("freq" , ["H" , "D" , "W" , "ME " , "MS" , "Q" , "B" , None ]) 
10821082    @pytest .mark .parametrize ("dtype" , [None , "uint8" ]) 
10831083    def  test_dt64arr_addsub_intlike (
10841084        self , dtype , box_with_array , freq , tz_naive_fixture 
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