The lady under the post moves away to the side from where the ball is played into the support.
In the meantime the first passer has run towards the support, after which the support player plays the ball to the outgoing pole lady and she steps with the ball threatening to run inside.
The first passer runs around the block and gets the ball from the side and takes the through ball.
Play this in the 3:3 as often as you can and do this on all sides of the post.
The third trio practices free balls and penalty throws. The starting ball can also be practiced new. (Similar to above)