Now we add another attribute: method-of-escape. For the method-of-escape attribute, we have 20 values: by foot, by car, etc. Each of them has 5 incidents. Although both “Japanese sword” and “by car” have 5 incidents, they should not be treated equally. The “Japanese sword” is more distinctive (larger score) because all other incidents involve the use of “guns”, or in other words, the uncertainty level of the weapon-used attribute is smaller.