Both move up and down the lineup when called upon and are commonly used to either spark lines and provide a level of stability to different trios.
"The last couple of games, actually later in games, Copp would move with Lowry and Tanev and I would go with Patty and Bryan Little," said Perreault.
"It's a long season, you got to fight for every inch in this league and it's a good learning curve for the young guys."