user: Question: What is the number for future stem for poztu?
Columns: ['Perfect stem', 'Future stem', 'Imperfect stem', 'Short stem', 'Meaning']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['hartu', 'hartuko', 'hartzen', 'har', "'take'"]
SQL:

assistant: SELECT "Future stem" FROM "Table" WHERE "Perfect stem" = 'poztu';