diff --git a/.gitmodules b/.gitmodules
index 0bc314b..affdd48 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -5,3 +5,7 @@
 [submodule "usth/ICT2.8"]
 	path = usth/ICT2.8
 	url = https://github.com/McSinyx/os2020.git
+
+[submodule "usth/ICT2.9/speakerid"]
+	path = usth/ICT2.9/speakerid
+	url = https://github.com/McSinyx/speakerid.git
diff --git a/README.md b/README.md
index dd9b524..839d24f 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ this README as well as commit messages are duolingo (anglais et vietnamien).
 
 |    Thư mục   |                      Nguồn đề bài                      |
 | ------------ | ------------------------------------------------------ |
-| `\d{2}`      | Đề thi, kiểm tra phân theo lớp                         |
+| `2ndary`     | Secondary school competitions                          |
 | `coci`       | [Giải Tin học Croatia mở rộng][0]                      |
 | `codechef`   | [Codechef][2]                                          |
 | `codeforces` | [Codeforces][3]                                        |
@@ -18,7 +18,6 @@ this README as well as commit messages are duolingo (anglais et vietnamien).
 | `paip`       | Paradigms of Artificial Intelligence Programming       |
 | `sicp`       | Structure and Interpretation of Computer Programs      |
 | `thinkperl6` | Think Perl 6                                           |
-| `tht`        | Hội thi Tin học trẻ                                    |
 | `toys`       | Programs that don't deserve their own repo             |
 | `usth`       | L'Université des Sciences et des Technologies de Hanoï |
 
diff --git a/usth/ICT2.9/anon.pdf b/usth/ICT2.9/compose/anon.pdf
similarity index 100%
rename from usth/ICT2.9/anon.pdf
rename to usth/ICT2.9/compose/anon.pdf
diff --git a/usth/ICT2.9/anon.tex b/usth/ICT2.9/compose/anon.tex
similarity index 100%
rename from usth/ICT2.9/anon.tex
rename to usth/ICT2.9/compose/anon.tex
diff --git a/usth/ICT2.9/blue-ocean-floor.wav b/usth/ICT2.9/practical/blue-ocean-floor.wav
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rename from usth/ICT2.9/blue-ocean-floor.wav
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diff --git a/usth/ICT2.9/dsp.ipynb b/usth/ICT2.9/practical/dsp.ipynb
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diff --git a/usth/ICT2.9/filters.ipynb b/usth/ICT2.9/practical/filters.ipynb
similarity index 100%
rename from usth/ICT2.9/filters.ipynb
rename to usth/ICT2.9/practical/filters.ipynb
diff --git a/usth/ICT2.9/output_bartlett.wav b/usth/ICT2.9/practical/output_bartlett.wav
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diff --git a/usth/ICT2.9/output_bessel.wav b/usth/ICT2.9/practical/output_bessel.wav
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diff --git a/usth/ICT2.9/output_blackman.wav b/usth/ICT2.9/practical/output_blackman.wav
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diff --git a/usth/ICT2.9/output_butterworth.wav b/usth/ICT2.9/practical/output_butterworth.wav
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diff --git a/usth/ICT2.9/output_chebyshev.wav b/usth/ICT2.9/practical/output_chebyshev.wav
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rename from usth/ICT2.9/output_chebyshev.wav
rename to usth/ICT2.9/practical/output_chebyshev.wav
diff --git a/usth/ICT2.9/output_hamming.wav b/usth/ICT2.9/practical/output_hamming.wav
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rename from usth/ICT2.9/output_hamming.wav
rename to usth/ICT2.9/practical/output_hamming.wav
diff --git a/usth/ICT2.9/output_sinc.wav b/usth/ICT2.9/practical/output_sinc.wav
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rename from usth/ICT2.9/output_sinc.wav
rename to usth/ICT2.9/practical/output_sinc.wav
diff --git a/usth/ICT2.9/speakerid b/usth/ICT2.9/speakerid
new file mode 160000
index 0000000..b79672f
--- /dev/null
+++ b/usth/ICT2.9/speakerid
@@ -0,0 +1 @@
+Subproject commit b79672fba4a4419bc301184c1f5c1eac21572780