user: Question: What is the average FA Cup Goal value for players that have 0 Other goals, 0 FL Cup goals, and fewer than 39 League goals?
Columns: ['Name', 'League Goals', 'FA Cup Goals', 'FL Cup Goals', 'Other Goals', 'Total', 'Career']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'text']
Sample row: ['George Brown', 142.0, 17.0, 0.0, 0.0, 159.0, '1921–1929']
SQL:

assistant: SELECT AVG("FA Cup Goals") FROM "Table" WHERE "Other Goals" = 0.0 AND "FL Cup Goals" = 0.0 AND "League Goals" < 39.0;