Table: 1995 european judo championships
Question: How many nations won medals in at least two categories?
Step 1 (Operation, Indexing): gold	silver bronze
Step 2 (Reasoning, Other Commonsense Reasoning): at least two categories
Step 3 (Reasoning, Aggregating): COUNT, nations which have medals in at least two categories
Step 4 (Operation, Filter): nations which have medals in at least two categories
Answer: 10