the solution from the operator, page-19

For those of you debating how big thanksgiving actually is in the States.
Wikipedia:

Thanksgiving is a four-day or five-day weekend vacation for schools and colleges. Most business and government workers (78% in 2007) are given Thanksgiving and the day after as paid holidays.

The Friday after Thanksgiving, although not a Federal holiday, is a holiday for many companies, except for those in retail. It is also a day off for most schools. It is popularly known as Black Friday, so-called because of the heavy shopping traffic on that day. Black Friday is considered to be the start of the Christmas shopping season.