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diff --git a/docs/directory-struct.fig b/docs/directory-struct.fig
deleted file mode 100644
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diff --git a/docs/ml-principle2.fig b/docs/ml-principle2.fig
deleted file mode 100644
index d5a69a1..0000000
--- a/docs/ml-principle2.fig
+++ /dev/null
@@ -1,50 +0,0 @@
-#FIG 3.1
-Landscape
-Center
-Inches
-1200 2
-6 150 975 975 1800
-4 0 -1 0 0 1 10 0.0000 0 135 630 150 1125 The Reply\001
-4 0 -1 0 0 1 10 0.0000 0 105 795 150 1320 to the article\001
-4 0 -1 0 0 1 10 0.0000 0 105 780 150 1515 is sent to the\001
-4 0 -1 0 0 1 10 0.0000 0 135 765 150 1710 server again.\001
--6
-6 1650 75 2775 450
-4 0 -1 0 0 1 10 0.0000 0 105 915 1650 225 Subscribers all\001
-4 0 -1 0 0 1 10 0.0000 0 105 1065 1650 420 around the world\001
--6
-6 1200 2850 2625 3225
-4 0 -1 0 0 1 10 0.0000 0 135 1185 1200 3000 The original author\001
-4 0 -1 0 0 1 10 0.0000 0 135 1395 1200 3195 receives the reply, too.\001
--6
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diff --git a/docs/router.bm b/docs/router.bm
deleted file mode 100644
index 002a15a..0000000
--- a/docs/router.bm
+++ /dev/null
@@ -1,15 +0,0 @@
-#define router_width 38
-#define router_height 27
-static char router_bits[] = {
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-   0x01, 0x04, 0x02, 0x00, 0x20, 0x01, 0x00, 0x00, 0x00, 0x20, 0xff, 0xff,
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diff --git a/docs/world.bm b/docs/world.bm
deleted file mode 100644
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