Task: Cell-entity-annotation (source dataset: SemTab2019)

Your task is to annotate a cell in a table, using the DBpedia resource URI that best describes the entity referenced in the cell.
 
No explanation, return the DBpedia entity in JSON format: {"DBpedia entity": "<DBpedia entity>"}. Please note that DBpedia entity URIs are in the format of "http://dbpedia.org/resource/<entity>".

Input Table:
|   row_idx | col0                  | col1       | col2       | col3       | col4       |
|----------:|:----------------------|:-----------|:-----------|:-----------|:-----------|
|         1 | USS Racine            | 1945-01-22 | 1943-09-14 | 1944-03-15 | 1946-06-27 |
|         2 | USS Racine            | 1971-07-09 | 1969-12-13 | 1970-08-15 | 1993-10-02 |
|         3 | USS Raccoon           | 1944-02-01 | 1943-11-07 | 1943-12-23 | 1946-07-10 |
|         4 | USS Raby              | 1943-12-07 | 1943-06-07 | 1943-09-04 | 1953-12-22 |
|         5 | USS R-9               | 1919-07-30 | 1918-03-06 | 1919-05-24 | 1931-05-02 |
|         6 | USS R-8               | 1919-07-21 | 1918-03-04 | 1919-04-17 | 1931-05-02 |
|         7 | USS R-7               | 1919-06-12 | 1917-12-06 | 1919-04-05 | 1931-05-02 |
|         8 | USS R-6               | 1919-05-01 | 1917-12-17 | 1919-03-01 | 1931-05-04 |
|         9 | USS R-5               | 1919-04-15 | 1917-10-16 | 1918-11-24 | 1932-06-30 |
|        10 | USS R-4               | 1919-03-28 | 1917-10-16 | 1918-10-26 | 1945-06-18 |
|        11 | USS R-3               | 1919-04-17 | 1917-12-11 | 1919-01-18 | 1934-08-10 |
|        12 | USS R-27              | 1919-09-03 | 1917-05-16 | 1918-09-23 | 1925-04-24 |
|        13 | USS R-26              | 1919-10-23 | 1917-04-26 | 1919-06-18 | 1925-06-12 |
|        14 | USS R-25              | 1919-10-23 | 1917-04-26 | 1919-05-15 | 1924-06-21 |
|        15 | USS R-24              | 1919-06-27 | 1917-05-09 | 1918-08-21 | 1925-06-11 |
|        16 | USS R-23              | 1919-10-23 | 1917-04-25 | 1918-11-05 | 1925-04-24 |
|        17 | USS R-21              | 1919-06-17 | 1917-04-19 | 1918-07-10 | 1924-06-21 |
|        18 | USS R-20              | 1918-10-26 | 1917-06-04 | 1918-01-21 | 1931-05-15 |
|        19 | USS R-1               | 1918-12-16 | 1917-10-16 | 1918-08-24 | 1931-05-01 |
|        20 | USS R-19              | 1918-10-07 | 1917-06-23 | 1918-01-28 | 1931-05-15 |
|        21 | USS R-18              | 1918-09-11 | 1917-06-16 | 1918-01-08 | 1931-05-13 |
|        22 | USS R-17              | 1918-08-17 | 1917-05-05 | 1917-12-24 | 1931-05-15 |
|        23 | USS R-15              | 1918-07-27 | 1917-04-30 | 1917-10-12 | 1931-05-07 |
|        24 | USS R-14              | 1919-12-24 | 1918-11-06 | 1919-10-10 | 1945-05-07 |
|        25 | USS R-13              | 1919-10-17 | 1918-03-27 | 1919-08-27 | 1945-09-14 |
|        26 | USS R-12              | 1919-09-23 | 1918-03-28 | 1919-08-15 | 1932-12-07 |
|        27 | USS R-11              | 1919-09-05 | 1918-03-18 | 1919-07-21 | 1945-09-05 |
|        28 | USS R-10              | 1919-08-20 | 1918-03-21 | 1919-06-28 | 1945-06-18 |
|        29 | USS Quirinus          | 1945-06-15 | 1945-03-03 | 1945-06-04 | 1947-03-27 |
|        30 | USS Quincy            | 1943-12-15 | 1941-10-09 | 1943-06-23 | 1954-07-02 |
|        31 | USS Quillback         | 1944-12-29 | 1944-06-27 | 1944-10-01 | 1973-03-23 |
|        32 | USS Quick             | 1942-07-03 | 1941-11-03 | 1942-05-03 | 1949-05-28 |
|        33 | USS Queens            | 1944-12-16 | 1944-03-02 | 1944-09-12 | 1946-06-10 |
|        34 | USS Queenfish         | 1944-03-11 | 1943-07-27 | 1943-11-30 | 1963-03-01 |
|        35 | USS Quastinet         | 1944-11-06 | 1944-08-02 | 1944-09-24 | 1946-04-16 |
|        36 | USS Quapaw            | 1944-05-06 | 1942-12-28 | 1943-05-15 | 1948-04-30 |
|        37 | USS Quail             | 1945-03-05 | 1944-04-12 | 1944-08-20 | 1955-08-12 |
|        38 | USS Pyro              | 1959-07-24 | 1957-10-21 | 1958-11-05 | 1994-05-31 |
|        39 | USS Pyro              | 1920-08-10 | 1918-08-09 | 1919-12-16 | 1924-09-10 |
|        40 | USS Putnam            | 1944-10-12 | 1943-07-11 | 1944-03-26 | 1973-08-06 |
|        41 | USS Putnam            | 1919-12-18 | 1919-06-30 | 1919-09-30 | 1929-09-21 |
|        42 | USS Pursuit           | 1943-04-30 | 1941-11-12 | 1942-06-12 | 1947-04-30 |
|        43 | USS Pulaski County    | 1945-03-27 | 1944-12-16 | 1945-02-11 | 1946-08-29 |
|        44 | USS Puget Sound       | 1968-04-27 | 1965-02-15 | 1966-09-16 | 1996-01-27 |
|        45 | USS Puffer            | 1943-04-27 | 1942-02-16 | 1942-11-21 | 1946-06-28 |
|        46 | USS Pueblo            | 1944-05-27 | 1943-11-14 | 1944-01-20 | 1946-04-06 |
|        47 | USS Ptarmigan         | 1945-01-15 | 1944-03-09 | 1944-07-15 | 1946-06-03 |
|        48 | USS Pruitt            | 1920-06-09 | 1919-06-18 | 1920-04-20 | 1945-11-16 |
|        49 | USS Prudent           | 1943-08-16 | 1942-08-14 | 1942-12-04 | 1945-10-11 |
|        50 | USS Provo Victory     | 1944-10-18 | 1944-06-28 | 1944-09-09 | 1946-04-10 |
|        51 | USS Providence        | 1945-05-15 | 1943-07-27 | 1944-12-28 | 1949-06-14 |
|        52 | USS Proton            | 1945-05-15 | 1945-03-27 | 1945-04-25 | 1948-04-29 |
|        53 | USS Proteus           | 1944-01-31 | 1941-09-15 | 1942-11-12 | 1947-09-26 |
|        54 | USS Proteus           | 1913-07-09 | 1911-10-31 | 1912-09-14 | 1924-03-25 |
|        55 | USS Protector         | 1943-12-28 | 1942-04-30 | 1943-04-27 | 1946-05-15 |
|        56 | USS Protector         | 1957-02-20 | 1945-01-31 | 1945-03-15 | 1965-07-28 |
|        57 | USS Proserpine        | 1945-05-31 | 1944-10-02 | 1944-12-28 | 1947-01-18 |
|        58 | USS Propus            | 1944-06-22 | 1944-01-31 | 1944-03-29 | 1945-11-20 |
|        59 | USS Prometheus        | 1910-01-15 | 1907-10-18 | 1908-12-05 | 1913-04-07 |
|        60 | USS Project           | 1944-08-22 | 1943-07-01 | 1943-11-20 | 1946-06-13 |
|        61 | USS Procyon           | 1941-08-28 | 1940-01-15 | 1940-11-14 | 1946-03-23 |
|        62 | USS Prince William    | 1943-04-09 | 1942-05-18 | 1942-08-23 | 1946-08-29 |
|        63 | USS Prince Georges    | 1943-11-10 | 1942-09-20 | 1942-10-30 | 1946-04-12 |
|        64 | USS Prime             | 1944-09-12 | 1943-09-15 | 1944-01-22 | 1946-05-29 |
|        65 | USS Pride             | 1943-11-13 | 1943-04-12 | 1943-07-03 | 1954-06-01 |
|        66 | USS Prichett          | 1944-01-15 | 1942-07-20 | 1943-07-31 | 1970-01-10 |
|        67 | USS Price             | 1944-01-12 | 1943-08-24 | 1943-10-30 | 1960-06-30 |
|        68 | USS Prevail           | 1943-04-17 | 1941-11-15 | 1942-09-13 | 1946-05-31 |
|        69 | USS Preston           | 1944-03-20 | 1943-06-13 | 1943-12-12 | 1969-11-15 |
|        70 | USS Preston           | 1921-04-13 | 1919-07-19 | 1920-08-07 | 1930-05-01 |
|        71 | USS Preston           | 1909-12-21 | 1908-04-28 | 1909-07-14 | 1919-07-17 |
|        72 | USS Presley           | 1944-11-07 | 1944-06-06 | 1944-08-19 | 1946-06-20 |
|        73 | USS Presidio          | 1945-04-09 | 1944-12-06 | 1945-02-17 | 1946-06-20 |
|        74 | USS President Polk    | 1943-10-04 | 1940-10-07 | 1941-06-28 | 1946-01-26 |
|        75 | USS President Monroe  | 1943-08-20 | 1939-11-13 | 1940-08-07 | 1946-01-12 |
|        76 | USS President Jackson | 1942-01-16 | 1939-10-02 | 1940-06-07 | 1955-07-06 |
|        77 | USS President Hayes   | 1941-12-15 | 1939-12-26 | 1940-10-04 | 1949-06-30 |
|        78 | USS President Adams   | 1941-11-19 | 1940-06-06 | 1941-01-31 | 1950-06-14 |
|        79 | USS Preserver         | 1944-01-11 | 1942-10-26 | 1943-04-01 | 1947-04-23 |
|        80 | USS Prentiss          | 1945-02-11 | 1944-10-10 | 1944-12-06 | 1946-05-31 |
|        81 | USS Preble            | 1960-05-09 | 1957-12-16 | 1959-05-23 | 1991-11-15 |
|        82 | USS Preble            | 1920-03-19 | 1919-04-12 | 1920-03-08 | 1945-12-07 |
|        83 | USS Preble            | 1903-12-14 | 1899-04-21 | 1901-03-02 | 1919-07-11 |
|        84 | USS Pratt             | 1944-09-18 | 1944-04-11 | 1944-06-01 | 1946-05-14 |
|        85 | USS Prairie           | 1940-08-05 | 1938-12-07 | 1939-12-09 | 1993-03-26 |
|        86 | USS Poughkeepsie      | 1944-09-06 | 1943-06-03 | 1943-08-12 | 1945-09-02 |
|        87 | USS Potomac           | 1934-10-25 | 1934-03-05 | 1934-06-30 | 1945-11-15 |
|        88 | USS Portunus          | 1943-06-12 | 1942-11-12 | 1943-02-11 | 1946-04-18 |
|        89 | USS Portsmouth        | 1945-06-25 | 1943-06-28 | 1944-09-20 | 1949-06-15 |
|        90 | USS Portland          | 1970-10-03 | 1968-05-05 | 1969-12-20 | 2003-08-04 |
|        91 | USS Porterfield       | 1943-10-30 | 1942-12-12 | 1943-06-13 | 1969-11-07 |
|        92 | USS Porter            | 1944-06-24 | 1943-07-06 | 1944-03-13 | 1953-08-10 |
|        93 | USS Porter            | 1916-04-17 | 1914-08-24 | 1915-08-26 | 1922-06-23 |
|        94 | USS Porpoise          | 1903-09-19 | 1900-12-13 | 1901-09-23 | 1919-12-12 |
|        95 | USS Porpoise          | 1935-08-15 | 1933-10-27 | 1935-06-20 | 1945-11-15 |
|        96 | USS Pontus            | 1943-03-24 | 1942-07-13 | 1943-03-02 | 1946-04-11 |
|        97 | USS Pontotoc          | 1945-03-22 | 1944-01-15 | 1944-07-02 | 1946-04-26 |
|        98 | USS Pondera           | 1944-09-24 | 1944-04-28 | 1944-07-27 | 1946-04-06 |
|        99 | USS Ponchatoula       | 1944-10-06 | 1944-06-07 | 1944-07-30 | 1946-04-24 |
|       100 | USS Ponaganset        | 1944-05-15 | 1942-04-27 | 1943-07-10 | 1946-04-26 |
|       101 | USS Pompon            | 1943-03-17 | 1941-11-26 | 1942-08-15 | 1946-05-11 |
|       102 | USS Pomodon           | 1945-09-11 | 1945-01-29 | 1945-06-12 | 1955-04-01 |
|       103 | USS Pomfret           | 1944-02-19 | 1943-07-14 | 1943-10-27 | 1971-07-01 |
|       104 | USS Pollux            | 1942-04-27 | 1941-10-02 | 1942-02-05 | 1950-04-03 |
|       105 | USS Pollack           | 1964-05-26 | 1960-03-14 | 1962-03-17 | 1989-03-01 |
|       106 | USS Pollack           | 1937-01-15 | 1935-10-01 | 1936-09-15 | 1945-09-21 |
|       107 | USS Polana            | 1945-02-21 | 1944-12-11 | 1945-01-17 | 1946-03-21 |
|       108 | USS Point Defiance    | 1955-03-31 | 1953-11-23 | 1954-09-28 | 1983-09-30 |
|       109 | USS Point Cruz        | 1945-10-16 | 1944-12-04 | 1945-05-18 | 1947-06-30 |
|       110 | USS Pogy              | 1943-01-10 | 1941-09-15 | 1942-06-23 | 1943-02-01 |
|       111 | USS Pocono            | 1945-12-29 | 1944-11-30 | 1945-01-25 | 1949-06-19 |
|       112 | USS Pocomoke          | 1941-07-18 | 1939-08-14 | 1940-06-08 | 1946-07-10 |
|       113 | USS Pochard           | 1944-11-27 | 1944-02-10 | 1944-06-11 | 1947-01-15 |
|       114 | USS Pocatello         | 1944-02-18 | 1943-08-17 | 1943-10-17 | 1946-05-02 |
|       115 | USS Plymouth Rock     | 1954-11-29 | 1953-05-04 | 1954-05-07 | 1983-09-30 |
|       116 | USS Plunkett          | 1940-07-17 | 1939-03-01 | 1940-03-07 | 1946-05-03 |

Target cell located at row 17 and column col0:
USS R-21



col_id: 0
row_id: 17
cell_value: USS R-21
label: http://dbpedia.org/resource/USS_R-21_(SS-98) http://dbpedia.org/resource/SS-98 http://dbpedia.org/resource/USS_R-21
csv: v17_352
col_name: col0
case_id: 72526