Add command name to duplicate key error.
tree1e2304ec0b3db5ae2233a1a3a5f5ff30ef4f8b30
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-rw-r--r-- 9284 INSTALL
-rw-r--r-- 305 Makefile.am
-rw-r--r-- 20640 NEWS
-rw-r--r-- 1887 README
-rw-r--r-- 319 THANKS
-rw-r--r-- 1826 TODO.org
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drwxr-xr-x - debian
drwxr-xr-x - doc
drwxr-xr-x - libchess
drwxr-xr-x - m4
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drwxr-xr-x - src