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diff --git a/src/sounds/0.wav b/src/sounds/0.wav
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+++ b/src/sounds/0.wav
diff --git a/src/sounds/1.wav b/src/sounds/1.wav
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index 0000000..9267006
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+++ b/src/sounds/1.wav
diff --git a/src/sounds/2.wav b/src/sounds/2.wav
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+++ b/src/sounds/2.wav
diff --git a/src/sounds/3.wav b/src/sounds/3.wav
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+++ b/src/sounds/3.wav
diff --git a/src/sounds/4.wav b/src/sounds/4.wav
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+++ b/src/sounds/4.wav
diff --git a/src/sounds/5.wav b/src/sounds/5.wav
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+++ b/src/sounds/5.wav
diff --git a/src/sounds/6.wav b/src/sounds/6.wav
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+++ b/src/sounds/6.wav
diff --git a/src/sounds/7.wav b/src/sounds/7.wav
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+++ b/src/sounds/7.wav
diff --git a/src/sounds/8.wav b/src/sounds/8.wav
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+++ b/src/sounds/8.wav
diff --git a/src/sounds/9.wav b/src/sounds/9.wav
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+++ b/src/sounds/9.wav
diff --git a/src/sounds/README.md b/src/sounds/README.md
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@@ -0,0 +1,14 @@
+The `[0-9a-f].wav` files in this directory contain a human voice
+speaking each of the 16 hexadecimal digits.  If a captcha string
+consists of just hexadecimal digits (as is the case for captchas
+generated by the [captcha.c module](/finfo/src/captcha.c)) then these WAV
+files can be concatenated together to generate an audio reading of the
+captcha, which enables visually impaired users to complete the
+captcha.
+
+Each of the WAV files uses 8000 samples per second, 8 bits per sample
+and are 6000 samples in length.
+
+The recordings are made by Philip Bennefall and are of his own voice.
+Mr. Bennefall is himself blind and uses this system implemented with these
+recordings to complete captchas for Fossil.
diff --git a/src/sounds/a.wav b/src/sounds/a.wav
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index 0000000..258ebaa
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+++ b/src/sounds/a.wav
diff --git a/src/sounds/b.wav b/src/sounds/b.wav
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index 0000000..e3c8ff4
--- /dev/null
+++ b/src/sounds/b.wav
diff --git a/src/sounds/c.wav b/src/sounds/c.wav
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index 0000000..7794fa4
--- /dev/null
+++ b/src/sounds/c.wav
diff --git a/src/sounds/d.wav b/src/sounds/d.wav
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index 0000000..fd18062
--- /dev/null
+++ b/src/sounds/d.wav
diff --git a/src/sounds/e.wav b/src/sounds/e.wav
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index 0000000..8b1c1f6
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+++ b/src/sounds/e.wav
diff --git a/src/sounds/f.wav b/src/sounds/f.wav
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index 0000000..a6bb213
--- /dev/null
+++ b/src/sounds/f.wav