I don't understand what this means.

"- Modified PNF Trunk Patterns 4x6 (2 sets each for each movement)
- Decline Static Holds 3x4 (hold each position for 4-6 seconds)
- Weighted Stability Ball Holds 2x4 (hold each position for 4-6 seconds) "

First off, is the first statement talking about the next 2 statements?

and, I don't understand the "4x6", "3x4" and "2x4" in conjunction with "(2 sets each for each movement)" as stated in the first line.

I feel so dense.