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bergsoe committed a58af55

Grammar.

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 The `papl_yaobi` package is part of the [Papl path planning
 system][0].
 
-This directory contains a C library in `c_yaobi` that must be build
-and installed before the `papl_yaobi` Ocaml package can be build. The
+This directory contains a C library in `c_yaobi` that must be built
+and installed before the `papl_yaobi` Ocaml package can be built. The
 `c_yaobi` library assumes that `YAOBI_APP_USE_DOUBLE` was defined when
-[Yaobi][1] was build.
+[Yaobi][1] was built.
 
 [0]: http://www.bergsoe.org/papl
 [1]: http://yaobi.sourceforge.net/