user: Question: What is the total of quantity rebuilt if the type is 1b n2t and the railway number is 88, 118?
Columns: ['Class', 'Railway number(s)', 'Quantity rebuilt', 'Rebuildjahr(e)', 'Type']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['T2aa', '88, 118', 2.0, '1887–1892', '1B n2t']
SQL:

assistant: SELECT SUM("Quantity rebuilt") FROM "Table" WHERE "Type" = '1b n2t' AND "Railway number(s)" = '88, 118';