Stolen from ceder.net:
Quadruple <formation>s consist of four adjacent <
formation>s some of which have positions occupied by phantoms. Typically, the given <
formation> is a 4-dancer formation such as a Box, Column, Diamond, Line, or Wave.
Notes:
- Quadruple <formation> is analogous to Triple <formation> except that there are 4 occurrences of the given formations instead of 3.
- When doing a call in Quadruple <formation>, work only with the dancers and phantoms within your formation. Shape-changing calls will end in a different set of Quadruple <formation>s.