<para>If a unit A that conflicts with a unit B is scheduled to
be started at the same time as B, the transaction will either
- fail (in case both are required part of the transaction) or be
+ fail (in case both are required parts of the transaction) or be
modified to be fixed (in case one or both jobs are not a
required part of the transaction). In the latter case, the job
- that is not the required will be removed, or in case both are
+ that is not required will be removed, or in case both are
not required, the unit that conflicts will be started and the
unit that is conflicted is stopped.</para></listitem>
</varlistentry>