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diff --git a/books/1-8/index.json b/books/1-8/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..1bb5407c8fabf00d369be4dbdb6a884a3a817ae6
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+++ b/books/1-8/index.json
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diff --git a/books/2-1/index.json b/books/2-1/index.json
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index 0000000000000000000000000000000000000000..f9723e912e45c4f919fb8a6e6b1af0041972959e
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diff --git a/books/4-3/index.json b/books/4-3/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..cfbb0c48842fadebad3cec02bd7ca34c256a07e4
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diff --git a/books/4-9/index.json b/books/4-9/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..cda7d09038d27270722f1791b5e6c169f86c7444
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diff --git a/books/5-3/index.json b/books/5-3/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..c9c42cc5a1fdbbddef8ef92bfb17546ec1be4795
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\ No newline at end of file
diff --git a/books/5-8/index.json b/books/5-8/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..15e91e35a3c1f120299d04ff3f8cde92f0a956ad
--- /dev/null
+++ b/books/5-8/index.json
@@ -0,0 +1 @@
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diff --git a/books/8-7/index.json b/books/8-7/index.json
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index 0000000000000000000000000000000000000000..4b6d1cf4dd98d3f9874392f80ff8628c3ef54f9c
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diff --git a/books/9-1/index.json b/books/9-1/index.json
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index 0000000000000000000000000000000000000000..4065af60c0c10a9a624cdd1dee96b9e317918c84
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diff --git a/books/9-3/index.json b/books/9-3/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..50efd374d149254554495245707f1d8c7bff6788
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+++ b/books/9-3/index.json
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diff --git a/books/9-6/index.json b/books/9-6/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..09de6a5450568593b5dea73c2b4c23b26b5176fe
--- /dev/null
+++ b/books/9-6/index.json
@@ -0,0 +1 @@
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