user: Question: Who directed the episode that has 3X6752 listed as the production code?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. viewers (million)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [14.0, 1.0, '"Let It Snow"', 'Christopher Chulack', 'Ann Biderman and John Wells', 'January4,2011', '3X6751', '2.11']
SQL:

assistant: SELECT "Directed by" FROM "Table" WHERE "Production code" = '3X6752';