target pattern that matches the file name, @emph{and} all
prerequisites in that rule either exist or can be built. The rules
you write take precedence over those that are built in. Note however,
-that a rule whose prerequisites actually exist or are mentioned always
-takes priority over a rule with prerequisites that must be made by
-chaining other implicit rules.
+that a rule which can be satisfied without chaining other implicit
+rules (for example, one which has no prerequisites or its
+prerequisites already exist or are mentioned) always takes priority
+over a rule with prerequisites that must be made by chaining other
+implicit rules.
@cindex stem, shortest
It is possible that more than one pattern rule will meet these