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diff --git a/books/0-2/index.json b/books/0-2/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..6209844e931888e14beda2bbb4d200a22127041a
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diff --git a/books/1-3/index.json b/books/1-3/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..3b7daf64cb8fedd25b9550b6f353c7bfe836bb2e
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\ No newline at end of file
diff --git a/books/3-4/index.json b/books/3-4/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..d705de40d71eb057e390401aacaae35e80fa1709
--- /dev/null
+++ b/books/3-4/index.json
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diff --git a/books/3-7/index.json b/books/3-7/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..8044c1287d7273b04cdbc26468a81e55b496a1ae
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+++ b/books/3-7/index.json
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diff --git a/books/3-9/index.json b/books/3-9/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..50ed4fe344fb58d5c9c7396a407ab5da0bbd0d03
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diff --git a/books/4-4/index.json b/books/4-4/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..ed1202d3d44e609ef73b984056990d756d67da99
--- /dev/null
+++ b/books/4-4/index.json
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diff --git a/books/6-3/index.json b/books/6-3/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..e3b98f53dc189be113898d54ee9e4958a5473ced
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+++ b/books/6-3/index.json
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diff --git a/books/7-6/index.json b/books/7-6/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..5ae7d7d9935dfa82b7b31fa3171a457ddda1904d
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diff --git a/books/7-7/index.json b/books/7-7/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..76a406b5a47889d4bfab93e7986d8c02e3429d6b
--- /dev/null
+++ b/books/7-7/index.json
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diff --git a/books/8-4/index.json b/books/8-4/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..6f6dc1cfb434619029e5bebeedf3b189566f3f5d
--- /dev/null
+++ b/books/8-4/index.json
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diff --git a/books/8-8/index.json b/books/8-8/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..01c792d5ca1bb088b84667c43573793611527923
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diff --git a/books/8-9/index.json b/books/8-9/index.json
new file mode 100644
index 0000000000000000000000000000000000000000..06b189a517ec8ca44254643011bc3000db2bdcab
--- /dev/null
+++ b/books/8-9/index.json
@@ -0,0 +1 @@
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