Given: Two scrapers are being operated as a team for a highway excavation. The scrapers are equipped with bumpers and bails and each can provide power to help the other load. This type of operation has been described as _______.

Given: Two scrapers are being operated as a team for a highway excavation. The scrapers are equipped with bumpers and bails and each can provide power to help the other load. This type of operation has been described as _______.