From a Diamond or Generalized Single 1/4 Tag with the Centers in a Mini-Wave.
Centers do your part of Extend the Tag as the Others 1/4 toward the given
  direction (relative to the 4-dancer formation).  
  Adjust to end in a 2 x 2.
| |   |  |   |  | before Drop In
 |  | after 
 | 
 | |   |  |   |  | before Drop Right
 |  | after 
 | 
 | 
Note: Drop Back means Drop U-Turn Back (unless, of course, you are
  attempting to dance at a level way over your head!).
There is a potential ambiguity dependent upon whether
  the outsides turn 1/4 before or after the
  Centers Extend (pay special attention to dancers
   and
 and 
   below):
 below):
| |   |  | This is the starting formation for each of the following:
 |  |  |  |   |  |   |  | after Case 1
 (Ends 1/4 In thenCenters Extend & adjust) |  | after Case 2
 (Centers Extend & adjustthen original Ends 1/4 In) | 
 | 
We prefer Case 2 for the following reasons:
- It makes Drop a 4-dancer call instead of an 8-dancer call.
- It allows Drop direction to be called from any Single 1/4 Tag.
- It is consistent with the wording of the CALLERLAB definitions.
Interlocked Drop direction [C2V]:
 From Interlocked Diamonds. 
  Everyone except the Very Centers do a normal Drop direction
  as the Very Centers Interlocked Extend (as one movement back-to-back Slither and Extend).
Cross Drop direction [C4]:
 Centers 
  Cross Extend
  instead of Extend.
 Variations: 
- Center Six Drop direction;
- Grand Drop direction.