user: Question: What's the area of the voivodenship with 51 communes?
Columns: ['Abbreviation', 'Voivodeship', 'Capital', 'Area km² (1998)', 'Population (1980)', 'No. of cities', 'No. of communes']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'real']
Sample row: ['bp', 'Biała Podlaska Voivodeship', 'Biała Podlaska', '5348', '286 400', 6.0, 35.0]
SQL:

assistant: SELECT "Area km² (1998)" FROM "Table" WHERE "No. of communes" = 51.0;