Give you a statement and table with its title in Markdown format, please determine whether the statement is supported or refuted by, or is unrelated to the table. It'a binary classification problem, you should choose the answer between supported and refuted. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| prr class | builders model | build date | total produced | wheel arrangement | service | power output |
| es6 | sw | 1937 | 12 | b - b | switcher | nan |
| es6 | sw1 | 1942 - 1950 | 85 | b - b | switcher | nan |
| es10 | nw2 | 1941 - 1948 | 32 | b - b | switcher | nan |
| es12 | sw7 - sw9 | 1950 - 1953 | 84 | b - b | switcher | nan |
| es12 | sw1200 | 1957 | 35 | b - b | switcher | nan |
| ef15 | f3a , f7a | 1947 - 1952 | 203 | b - b | freight | nan |
| ef15 | f3b , f7b | 1947 - 1952 | 107 | b - b | freight | nan |
| epf15 | fp7a | 1952 | 40 | b - b | pass | nan |
| epf15 | fp7b | 1952 | 14 | b - b | pass | nan |
| ep20 | e7a | 1945 - 1949 | 46 | a1a - a1a | pass | nan |
| ep20 | e7b | 1945 - 1949 | 14 | a1a - a1a | pass | nan |
| ep22 | e8a | 1950 - 1952 | 74 | a1a - a1a | pass | nan |
| ers15 | gp7 | 1952 - 1953 | 66 | b - b | freight | nan |
| ers15ax | sd7 | 1953 | 2 | b - b | freight | nan |
| ers17 | gp9 | 1955 - 1959 | 310 | b - b | freight | nan |
| ers17a | sd9 | 1957 - 1958 | 25 | c - c | freight | nan |
| ef22 | gp30 | 1963 | 52 | b - b | freight | nan |
| ef25 | gp35 | 1964 - 1965 | 119 | b - b | freight | nan |
| ef25a | sd35 | 1965 | 40 | c - c | freight | nan |
| ef30a | sd40 | 1966 | 65 | c - c | freight | nan |
| ef36 | sd45 | 1966 | 65 | c - c | freight | nan |
| ef20a | gp38 | 1967 | 5 | b - b | freight | nan |
Title:
prr locomotive classification
Statement:
the prr class of freight train built before 1967 with a b - b wheel arrangement is the ef20a
Answer:
refuted