Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Class 8 Used Truck Volumes Flat in July, ACT Research August 27, 2015, 07:00 AM Related: ACT Research , Class 8 , Daimler , Freightliner , Kenworth , Mack , Navistar , Paccar , Peterbilt , Trucks , Used Equipment , Volvo

Answer: product_or_material_produced: Paccar, Truck; product_or_material_produced: Peterbilt, Truck; product_or_material_produced: Volvo, Truck; parent_organization: Peterbilt, Paccar; parent_organization: Kenworth, Paccar; product_or_material_produced: Kenworth, Truck; subsidiary: Paccar, Kenworth; owned_by: Peterbilt, Paccar