BEGIN:VCALENDAR
BEGIN:VFREEBUSY
FREEBUSY;FBTYPE=BUSY-UNAVAILABLE:19970308T160000Z/PT8H30M
END:VFREEBUSY
BEGIN:VFREEBUSY
FREEBUSY:19970308T160000Z/PT3H,19970308T200000Z/PT1H
END:VFREEBUSY
BEGIN:VFREEBUSY
FREEBUSY;FBTYPE=FREE:19970308T160000Z/PT3H,19970308T200000Z/PT1H
 ,19970308T230000Z/19970309T000000Z
END:VFREEBUSY
END:VCALENDAR