Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Chord | Root | Major Third | Perfect Fifth | Minor Seventh |
| --- | --- | --- | --- | --- |
| C7 | C | E | G | B♭ |
| C♯7 | C♯ | E♯ (F) | G♯ | B |
| D♭7 | D♭ | F | A♭ | C♭ (B) |
| D7 | D | F♯ | A | C |
| D♯7 | D♯ | F (G) | A♯ | C♯ |
| E♭7 | E♭ | G | B♭ | D♭ |
| E7 | E | G♯ | B | D |
| F7 | F | A | C | E♭ |
| F♯7 | F♯ | A♯ | C♯ | E |
| G♭7 | G♭ | B♭ | D♭ | F♭ (E) |
| G7 | G | B | D | F |
| G♯7 | G♯ | B♯ (C) | D♯ | F♯ |
| A♭7 | A♭ | C | E♭ | G♭ |
| A7 | A | C♯ | E | G |
| A♯7 | A♯ | C (D) | E♯ (F) | G♯ |
| B♭7 | B♭ | D | F | A♭ |
| B7 | B | D♯ | F♯ | A |
Question:
what's the total number of thirds you can make on a 7th form chord?
Answer:
17