In addition to the master calendar, a user may add {HEAD ~ secondary calendars} in {TAIL ~ the present invention} 
in
In addition to the master calendar , a user may add { HEAD ~ secondary calendars } in { TAIL ~ the present invention }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL