select lastname,part.description 
from customer inner join rep on customer.repnum = rep.repnum  
			  inner join orders on customer.customernum = orders.customernum 
              inner join orderline on orders.ordernum = orderline.ordernum 
              inner join part on orderline.partnum = part.partnum
where customer.repnum = ANY (SELECT customer.repnum from customer where customer.customernum = 
                        ALL (SELECT customer.customernum from customer WHERE part.description =
                        ANY(SELECT part.description from part)))

/* I was not really sure How to do this one, I spent way more time on this question than any of the other ones. 
/* Tried to utilize some understanding of ANY and ALL clauses to nest some checks in there. Not really sure if this
/* solution works or not.