Table: list of tallest buildings in the european union
Question: How many buildings in the European Union have held the title of tallest building for more than 10 years?
Step 1 (Reasoning, Temporal Reasoning): years as tallest, for more than 10 years
Step 2 (Operation, Indexing): years as tallest
Step 3 (Operation, Filter): years as tallest
Step 4 (Reasoning, Aggregating): COUNT, number of building
Answer: 4