If both Ends are Facing In, the caller can designate a 'preferred' 
    End to do the Circulate. For example, from Facing Lines, the caller could 
    say 
Prefer the End Girl for an In Roll Circulate.  In this case, 
    the End Girl does a Circulate, as the Others
    Flip (180°) one position toward the 'preferred' End. 
EN: 90