A set and a run need different cards
The described set uses three or four cards of the same rank. A run needs at least three consecutive cards in one suit. For example, 7♣, 7♦ and 7♥ illustrate an equal-rank set; 4♠, 5♠ and 6♠ illustrate a run. Changing the last card in that run to 6♥ breaks the same-suit condition.


