Thanks to the last few giveaways I have the Ar'kif Retrofit and Arkala Warbirds.
The wording on their respective unique items says that each is 1 of 4 pieces and lists the Arkala's quad cannons twice as two separate entities. The second line drops the [dmg]x4 suffix.
The set bonus only lists 3 set powers, which I believe is correct.
There are a few sets that require three pieces to be "Complete", but have four or more pieces in it. Example, the Undine set requires either a Heavy Bio-Molecular Phaser Turret or a Heavy Bio-Molecular -Disruptor- Turret. You can have both equipped if you want, but it doesn't give you anything extra.
On the other hand, just gave the set a look on the STO Gamepedia, and I think the double listing of the quad cannons is a bug.
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On the other hand, just gave the set a look on the STO Gamepedia, and I think the double listing of the quad cannons is a bug.