d for delete

Let us consider an example:

125,130d79

This means ``lines 125 to 130 of the last checked in version are deleted, and line 79 of the working file occupies where those lines used to be''.

This is followed by the deleted lines:

<   # this is just a bunch of
<   # comments that is no longer
<   # useful once the feature is
<   # implemented. Delete when the
<   # feature is implemented.
<   # end comment.