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nRF52 pin connection with 6-pin J-Link

Can the nRF52 be programmed by 6-pin J-Link Adapter by just connecting the following 4 pins,

Pin 1 : 3.3v Supply, Pin 2 SWDIO, Pin 4 SWDCLK, Pin 5 GND,

Can pins 3 & 6 of 6-pin J-Link Aapter be left unconnected or do we need to have some pull up/pull down on the pins?

The Adapter datasheet labels Pin 3 = nRESET and Pin 6=SWO but there is no additional information.

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