4.3 cw validation

4.4 cw searching techniques

1 How many of them are red?
There are 8
 2 How many of them are blue?
There are 14
 3 How many of them are happy?
There are 14
 4 How many of them are sad?
There are 16
 5 How many of them are red AND sad?
There are 4
 6 How many of them are blue AND have black eyes?
There are 8
 7 How many of them are green AND have white eyes AND are sad?
There are 3
 8 How many of them are blue OR green?
There are 21
 9 How many of them are happy OR have white eyes?
There are 7
10 How many of them are happy OR have black eyes OR are blue?
There are 4