From a (4-dancer) fractional tag position (i.e., Single 1/4 Tag, Mini-Wave Box, Single 3/4 Tag) or applicable Diamond.
Those with handholds (the mini-wave) 1/4 In, then pass by each other passing opposite shoulder
from original handhold, turn an extra 1/4 toward same direction, then Exend. The others adjust
as necessary to form a 2x2.
A 1/4 Tag, 3/4 Tag, or Diamonds ends in a 2x2; a 1/2 Tag ends in an opposite-handed 3/4 Tag.