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Instruction
Answer the question based on the provided table.


Table
Table Title: 'Scales with flat key signatures' regarding 'Key signature'
Table Content:
| Major key | Number of flats | Flat notes | Minor key | Enharmonic equivalent |
| --- | --- | --- | --- | --- |
| C major | 0 | - | A minor | None |
| F major | 1 | B♭ | D minor | None |
| B♭ major | 2 | B♭, E♭ | G minor | None |
| E♭ major | 3 | B♭, E♭, A♭ | C minor | None |
| A♭ major | 4 | B♭, E♭, A♭, D♭ | F minor | None |
| D♭ major | 5 | B♭, E♭, A♭, D♭, G♭ | B♭ minor | C♯ major/A♯ minor |
| G♭ major | 6 | B♭, E♭, A♭, D♭, G♭, C♭ | E♭ minor | F♯ major/D♯ minor |
| C♭ major | 7 | B♭, E♭, A♭, D♭, G♭, C♭, F♭ | A♭ minor | B major/G♯ minor |


Question
How many flats do the keys of F and B♭ major have?


Answer Format
The final answer should be a sentence and use the following format:
```json
{
    "answer": "your_generated_sentence_here"
}
```
rule
["F major (D minor) has one flat which is on the B; then B♭ major (G minor) has two flats (on B and E)."]