Dump is position on the break-side of the disc
Pushing defender upfield to gain more space in the backfield
Cut back in the same line into the space
Front of Stack extends the play and position the disc further into the break-side
Back of Stack continues the play to gain more yards downfield
3 pushes up to be the dump as everyone else push downfield into the stack. 6 prepares it's next cut. 1 can also replace 3 as the dump if 3 wants to clear into stack.