Read the passage below and solve the questions based on it.
In order to study the breakfast habits of the people in the city of Longkong, a survey of 400 families was conducted. Of these 400 families, 156 had cereals, 288 had eggs and 300 had toast. It was found that 212 families had egg and toast and 104 had cereal and toast, and 128 had egg and cereal and 84 had all three.
How many families had only two items?