Distinct subjects for predicate rdfs:subClassOf in graph ncal sorted by frequency

Resource	Count
ncal:Event	13
ncal:Todo	12
ncal:Journal	8
ncal:Freebusy	7
ncal:Alarm	5
ncal:Timezone	5
ncal:TimezoneObservance	3
ncal:Attachment	2
ncal:AccessClassification	1
ncal:AlarmAction	1
ncal:AttachmentEncoding	1
ncal:Attendee	1
ncal:AttendeeOrOrganizer	1
ncal:AttendeeRole	1
ncal:BydayRulePart	1
ncal:Calendar	1
ncal:CalendarDataObject	1
ncal:CalendarScale	1
ncal:CalendarUserType	1
ncal:EventStatus	1
ncal:FreebusyPeriod	1
ncal:FreebusyType	1
ncal:JournalStatus	1
ncal:NcalDateTime	1
ncal:NcalPeriod	1
ncal:NcalTimeEntity	1
ncal:Organizer	1
ncal:ParticipationStatus	1
ncal:RecurrenceFrequency	1
ncal:RecurrenceIdentifier	1
ncal:RecurrenceIdentifierRange	1
ncal:RecurrenceRule	1
ncal:RequestStatus	1
ncal:TimeTransparency	1
ncal:TodoStatus	1
ncal:Trigger	1
ncal:TriggerRelation	1
ncal:UnionOfAlarmEventFreebusyJournalTodo	1
ncal:UnionOfAlarmEventFreebusyTodo	1
ncal:UnionOfAlarmEventJournalTodo	1
ncal:UnionOfAlarmEventTodo	1
ncal:UnionOfEventFreebusy	1
ncal:UnionOfEventFreebusyJournalTodo	1
ncal:UnionOfEventJournalTimezoneTodo	1
ncal:UnionOfEventJournalTodo	1
ncal:UnionOfEventTodo	1
ncal:UnionOfTimezoneObservanceEventFreebusyJournalTimezoneTodo	1
ncal:UnionOfTimezoneObservanceEventFreebusyTimezoneTodo	1
ncal:UnionOfTimezoneObservanceEventJournalTimezoneTodo	1
ncal:UnionParentClass	1
ncal:Weekday	1