The Cottagers already knew they were getting promoted to the Premier League before the game.
But they have now secured their status as champions of the second division, as they look to make an impression on the top flight next term.
Ace marksman Aleksander Mitrovic was in excellent form in the game, netting his 42nd and 43rd goals of a remarkable season.
Youngster Fabio Carvalho was also on the scoresheet, along with midfielder Jean-Michel Seri.
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