T3b & t3f?

I’m making a test sock for a friend from her pattern. What exactly is T3B & T3F??? And is there a video?

She told me it was:
[COLOR=Red]T3F (Twist 3 Front): slip next 2 sts onto cable needle and hold in front of work, purl next st from left-hand needle, then [COLOR=Green]knit [/COLOR]sts from cable needle.[/COLOR]

[COLOR=Red]T3B (Twist 3 Back): slip next st to cable needle and hold in back of work, knit the next 2 sts from left-hand needle, then [COLOR=Green]purl [/COLOR]st from cable needle.[/COLOR]
[COLOR=Red]:whoosh:
[/COLOR]

It’s like a cable. Just follow the instructions in the descriptions step by step, don’t panic and they’ll come out right. You can practice them with some scrap yarn before doing them on the sock.