A 
Triple Column | Line | Wave is the name of a formation consisting
  of three adjacent 1 x 4 formations (Columns, Lines, or Waves) some of
  which contain phantom positions.  Work with the dancers and phantoms within your 4-spot
  formation.  Keep track of the phantoms and allow space for them upon the completion 
  of the call.  There should be a total of 12 dancer | phantom positions before and after each call. 
EN: 10