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:
| D 50 | D 49 | D 48 | D 47 | D 46 | D 45 | D 44 | D 43 | D 42 | D 41 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| D 11 | D 12 | D 13 | D 14 | D 15 | D 16 | D 17 | D 18 | D 19 | D 20 |
| D 30 | D 29 | D 28 | D 27 | D 26 | D 25 | D 24 | D 23 | D 22 | D 21 |
| D 31 | D 32 | D 33 | D 34 | D 35 | D 36 | D 37 | D 38 | D 39 | D 40 |
| D 50 | D 49 | D 48 | D 47 | D 46 | D 45 | D 44 | D 43 | D 42 | D 41 |
| D 51 | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority |
| D 51 | D 52 | D 53 | D 54 | D 55 | D 56 | D 57 | R 43 | R 42 | R 41 |
| R 31 | R 32 | R 33 | R 34 | R 35 | R 36 | R 37 | R 38 | R 39 | R 40 |
| R 30 | R 29 | R 28 | R 27 | R 26 | R 25 | R 24 | R 23 | R 22 | R 21 |
| R 11 | R 12 | R 13 | R 14 | R 15 | R 16 | R 17 | R 18 | R 19 | R 20 |
| R 10 | R 9 | R 8 | R 7 | R 6 | R 5 | R 4 | R 3 | R 2 | R 1 |
Question:
What is the D 42 when the D 50 is d 31?
Answer:
D 39