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 O | 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 O | D 49 √ | D 48 √ | D 47 √ | D 46 √ | D 45 √ | D 44 √ | D 43 √ | D 42 √ | D 41 √ |
| D 51 O | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority | ← Majority |
| D 51 O | D 52 O | D 53 + | D 54 + | I 1 @ | C 1 + | R 44 + | 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 O |
| 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:
Name the D 41 √ when it has D 43 √ of r 18
Answer:
R 20