user: Question: Which Gothic Letter has Proto-Germanic origin of /ɸ/; /b/?
Columns: ['Gothic Letter', 'Roman', 'Sound (phoneme)', 'Sound (allophone)', 'Proto-Germanic origin']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['��', 'b', '/[[|b]]/', '[[[|b]]]', '/b/']
SQL:

assistant: SELECT "Gothic Letter" FROM "Table" WHERE "Proto-Germanic origin" = '/ɸ/; /b/';