Answer Posted / prasad

"X uses Y" indicates that the task "X" has a subtask "Y";
that is, in the process of completing task "X", task "Y"
will be completed at least once.

"X extends Y" indecates that "X" is a task of the same type
as "Y", but "X" is a special, more specific case of
doing "Y". That is, doing X is a lot like doing Y, but X
has a few extra processes to it that go above and beyond
the things that must be done in order to complete Y.

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