Special weeks arrangement

from 2011-10-03 until 2011-12-20
from 2012-01-08 until 2012-03-30
from 2012-04-15 until 2012-05-11
from 2012-10-04 until 2012-12-21

Book 7 days - pay 6 days
Book 14 days - pay 12 days