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:
| ship 's name | date entered service | date withdrawn | tonnage | type of ship |
| oranje nassau | 27 august 1945 | july 1954 | 3053 | twin screw steamer |
| mecklenburg | 21 november 1945 | 25 october 1959 | 2907 | twin screw steamer |
| koningin emma | 5 march 1948 | december 1968 | 4353 | twin screw motorship |
| prinses beatrix | 31 may 1948 | september 1968 | 4353 | twin screw motorship |
| koningin wilhelmina | 7 february 1960 | 1 july 1978 | 6228 | twin screw motorship |
| koningin juliana | 17 october 1968 | 8 april 1984 | 6682 | twin screw ro - ro motorship |
| prinses beatrix | 29 june 1978 | may 1986 | 9356 | twin screw ro - ro motorship |
| prins oberon | 11 february 1983 | 11 march 1983 | 7993 | twin screw ro - ro motorship |
| zeeland | 1 april 1984 | 25 march 1986 | 6801 | twin screw ro - ro motorship |
| armorique | 25 march 1986 | 16 april 1986 | 5731 | twin screw ro - ro motorship |
| koningin beatrix | 16 april 1986 | 2 june 1997 | 31189 | twin screw ro - ro motorship |
| duchess anne | january 1989 | february 1989 | 9796 | twin screw ro - ro motorship |
Title:
none
Statement:
7993 is the sum of tonnage for all but three of the twin screw ro - ro motorships
Answer:
refuted