In the last 10 years, the number of categories has swelled by 19, to 108.

They are given every year in a number of categories.

The number of categories was cut from 109 to 78.

The number of categories is limited so that the classification does not become too big.

In 2012, the number of categories was limited to five.

The minimum number of categories under the existing rules is 17.

At present there are a number of main categories that these robots fall into.

With modern data processing facilities, the numbers of categories are not likely to be a problem.

Awards are given in a number of categories, including the following.

In 1927, he reduced the number of categories to ten.