From a 1x4, some callers add the word 'Single' before calling 
Pass & Roll.
    They think that since the call is normally done from a 
2 x 4 (an Eight Chain Thru
    formation), 'Single' allows the call to be done from a 
1 x 4.  
    
This is an incorrect usage of the term 
    Single.
    The word 'Single' is not required. 
EN: 100