What is every previous class when the previous number is 61323?
{'header': ['Number', 'Previous Number(s)', 'Previous Class', 'Converted', 'Use', 'Withdrawn', 'Disposal'], 'page_title': 'British Rail Eastern Region departmental locomotives', 'section_title': 'Great Northern section', 'caption': 'Great Northern section', 'rows': [['1', '68845', 'J52', '1952', 'Steam shunter', '1958', 'Scrapped (1958)'], ['2 (1st)', '68816', 'J52', '1952', 'Steam shunter', '1956', 'Scrapped (1956)'], ['2 (2nd)', '68858', 'J52', '1956', 'Steam shunter', '1961', 'Scrapped (1961)'], ['3', '68181', 'Y3', '1952', 'Steam shunter', '1959', 'Scrapped (1959)'], ['4', '68132', 'Y1', '1952', 'Steam shunter', '1959', 'Scrapped (1959)'], ['5', '68165', 'Y3', '1953', 'Steam shunter', '1958', 'Scrapped (1958)'], ['6', '68133', 'Y1', '1953', 'Steam shunter', '1955', 'Scrapped (1955)'], ['7', '68166', 'Y3', '1953', 'Steam shunter', '1964', 'Scrapped (1964)'], ['8', '68183', 'Y3', '1955', 'Steam shunter', '1959', 'Scrapped (1959)'], ['9', '68840', 'J52', '1958', 'Steam shunter', '1961', 'Scrapped (1961)'], ['10', '68911', 'J50', '1961', 'Steam shunter', '1965', 'Scrapped (1965)'], ['11', '68914', 'J50', '1961', 'Steam shunter', '1965', 'Scrapped (1965)'], ['12', '68917', 'J50', '1962', 'Steam shunter', '1965', 'Scrapped (1965)'], ['13', '68928', 'J50', '1962', 'Steam shunter', '1965', 'Scrapped (1965)'], ['14', '68961', 'J50', '1962', 'Steam shunter', '1965', 'Scrapped (1965)'], ['15', '68971', 'J50', '1962', 'Steam shunter', '1965', 'Scrapped (1965)'], ['16', '68976', 'J50', '1962', 'Steam shunter', '1965', 'Scrapped (1965)'], ['17', '61059', 'B1', '1963', 'Stationary boiler for carriage warming', '1966', 'Scrapped (1966)'], ['18', '61181', 'B1', '1963', 'Stationary boiler for carriage warming', '1965', 'Scrapped (1966)'], ['19', '61204', 'B1', '1963', 'Stationary boiler for carriage warming', '1966', 'Scrapped (1966)'], ['20', '61205', 'B1', '1963', 'Stationary boiler for carriage warming', '1965', 'Scrapped (1966)'], ['21 (1st)', '68162', 'Y3', '1956', 'Steam shunter', '1960', 'Scrapped (1960)'], ['21 (2nd)', '61233', 'B1', '1963', 'Stationary boiler for carriage warming', '1966', 'Scrapped (1966)'], ['22', '61252', 'B1', '1963', 'Stationary boiler for carriage warming', '1964', 'Scrapped (1966)'], ['23', '61300', 'B1', '1963', 'Stationary boiler for carriage warming', '1965', 'Scrapped (1966)'], ['24 (1st)', '61323', 'B1', '1963', 'Stationary boiler for carriage warming', '1963', 'Scrapped (1964)'], ['24 (2nd)', '61375', 'B1', '1963', 'Stationary boiler for carriage warming', '1966', 'Scrapped (1966)'], ['25', '61272', 'B1', '1965', 'Stationary boiler for carriage warming', '1966', 'Scrapped (1966)'], ['26', '61138', 'B1', '1965', 'Stationary boiler for carriage warming', '1967', 'Scrapped (1968)'], ['27', '61105', 'B1', '1965', 'Stationary boiler for carriage warming', '1966', 'Scrapped (1966)'], ['28', '61194', 'B1', '1965', 'Stationary boiler for carriage warming', '1966', 'Scrapped (1966)'], ['29', '61264', 'B1', '1965', 'Stationary boiler for carriage warming', '1967', 'Preserved'], ['30', '61050', 'B1', '1966', 'Stationary boiler for carriage warming', '1968', 'Scrapped (1968)'], ['31 (2nd)', '61051', 'B1', '1966', 'Stationary boiler for carriage warming', '1966', 'Scrapped (1966)']]}