Table: papal election , september 1276
Question: What is the most common source of elevation to cardinalhood (bishop, priest, deacon) among the electors in this election?
Step 1 (Reasoning, Grounding): most common, max appearance
Step 2 (Operation, Indexing): order and title
Step 3 (Operation, Grouping): type of source of elevation
Step 4 (Reasoning, Aggregating): COUNT, number of appearance
Answer: deacon