Books: cannot be negative.
Months in Academic Year: must be between 1 and 12.
Phone including Long Distance: cannot be negative.
Cell Phone: cannot be negative.
Cable TV: cannot be negative.
Internet Connection: cannot be negative
Electricity / Natural Gas: cannot be negative.
Food and Drink: cannot be negative.
Entertainment: cannot be negative.
Laundry: cannot be negative.
Clothing: cannot be negative.
Personal Products: cannot be negative.
Car Payments: cannot be negative.
Car Insurance: cannot be negative.
Parking: cannot be negative.
Gas: cannot be negative.
Travel to / from Home: cannot be negative.
Vacation: cannot be negative.
Health: cannot be negative.
Gym: cannot be negative.
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