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