diff --git a/assets/section_1.6_1686904326481_0.edn b/assets/section_1.6_1686904326481_0.edn
index cbebe3f..063a104 100644
--- a/assets/section_1.6_1686904326481_0.edn
+++ b/assets/section_1.6_1686904326481_0.edn
@@ -14,68 +14,5 @@
                                    :height 453.54333333333324}),
                           :page 4},
                :content {:text "Independence of Two Events"},
-               :properties {:color "blue"}}
-              {:id #uuid "648c1e7c-ce3f-4aea-bff6-4d35373becbb",
-               :page 12,
-               :position {:bounding {:x1 14.173179626464844,
-                                     :y1 13.255218505859375,
-                                     :x2 337.1776657104492,
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-                          :page 12},
-               :content {:text "Independence of Several Events"},
-               :properties {:color "blue"}}
-              {:id #uuid "648c1e9c-3bfe-4ca3-b4c8-e363af9758fa",
-               :page 12,
-               :position {:bounding {:x1 227.61067962646484,
-                                     :y1 202.00521850585938,
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-                                   :width 604.7249999999999,
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-                          :page 12},
-               :content {:text "mutually independent"},
-               :properties {:color "yellow"}}
-              {:id #uuid "648c1ea8-997d-4d93-b7ac-c7a5b9300bed",
-               :page 12,
-               :position {:bounding {:x1 0,
-                                     :y1 188.69793701171875,
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-                          :page 12},
-               :content {:text "Events A, B and C are said to be pairwise independent if the first three equations hold."},
-               :properties {:color "yellow"}}],
- :extra {:page 15}}
+               :properties {:color "blue"}}],
+ :extra {:page 12}}
diff --git a/pages/总复习2023t1.md b/pages/总复习2023t1.md
index fd3e172..706c269 100644
--- a/pages/总复习2023t1.md
+++ b/pages/总复习2023t1.md
@@ -2678,7 +2678,7 @@
 					- ((648c1e25-4336-48ba-bd20-d156a4c8df7a)) ![section 1.6.pdf](../assets/section_1.6_1686904326481_0.pdf)
 					- ((648c1e7c-ce3f-4aea-bff6-4d35373becbb))
 						- ((648c1ea8-997d-4d93-b7ac-c7a5b9300bed))
-					-
+						- Pairwise independence $$!=$$ Mutually independence
 			- LATER 学积分
 			  :LOGBOOK:
 			  CLOCK: [2023-06-03 Sat 17:05:07]--[2023-06-03 Sat 17:05:08] =>  00:00:01