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