In the following email, what style problem does SENTENCE $6$ contain?

TO: All employees

FROM: Janice Logan, IT Manager

DATE: March $3,2003$

SUBJECT: Meeting to discuss new copier, March $31,3$:$00-3$:$30$ pm

$(1)$ Please congregate in the work room on Thursday, March $31,$ from $3$:$00$ to $3$:$30$ pm to learn about our new company copier.

$(2)$ Our employees have complained about several problems with our current machine. $(3)$ Therefore, we have made a decision to purchase a new copier, the Xorex $9000.(4)$ With this large$-$scale machine, we can produce our spiral$-$bound books much faster.

$(5)$ At the meeting Richard Farley, the training director at Creative Technologies, will provide a hands$-$on demonstration for each staff member. $(6)$ Attached please find a copy of the operating manual for the Xorex $9000.$