a) Double-team from the top
On a post feed to 5, double team from the top with X1, X5 takes away baseline, X2 takes away a return pass to 2 (face guard). Here 4 dives.
Variation - X5 fronts the low post, front pivots on his top (right) foot on a post entry to take away middle, the bottom of the i comes across to take away the baseline.
Avery Johnson - if trapping on air time and big defender X4 is near a small nail (top) defender then X4 traps, which is more effective at stopping the ball and easier to match up on the pass out since most of the time 4 will dive on the double team.