Table: 1991 foster 's cup
Question: What is the most common day of the week for Foster's Cup matches to be played?
Step 1 (Reasoning, Grounding): day, date
Step 2 (Operation, Grouping): date
Step 3 (Reasoning, Aggregating): COUNT, day of the week
Step 4 (Reasoning, Aggregating): MAX, number of day of the week
Answer: wednesday