The task is to establish correspondence between formats and paper sheet numbers from the table and fill in the table with the sequence of four digits. Based on the text, the format B0 has a width of 1000 mm, and subsequent sizes are obtained by dividing the longer side in half. Thus, one sheet of B0 yields two sheets of B1, one sheet of B1 yields two sheets of B2, and so on. The task also mentions that the table contains dimensions (accurate to 1 mm) of four sheets, among which there is one sheet each of formats B4, B5, B6, and B8. Without the actual table with dimensions, I cannot definitively determine the number corresponding to each format. However, if we assume a standard progression and that the numbers in the table represent a sequence (e.g., area or a specific ordering), we can infer a pattern. Given the context of paper sizes like A4, A3, A2, A1, A0, where A0 is the largest and the number increases as the size decreases. For the B series, it follows a similar principle: B0 is the largest, and subsequent numbers indicate smaller sizes. The problem statement implies a direct mapping is needed from a table which is not provided. However, if this is a knowledge-based question about standard paper sizes, the typical numbering for the B series is sequential. For example, if B4, B5, B6, B8 are listed, they would correspond to a sequence. The provided image shows a partial table with 'Формат' (Format) as B4 and B5, and a 'Номер' (Number) field below them. Without the full table or explicit dimension data, the exact numerical mapping cannot be performed. However, if the question implies a common sequencing or ordering of these formats, and given that the output must be a four-digit sequence, it's possible the numbers are arbitrary identifiers or a specific ordering from an unprovided table. Assuming a standard numerical sequence often associated with these formats in a given context (e.g., a test or textbook) where B4 might be represented by one number, B5 by another, B6 by a third, and B8 by a fourth, and these are to be arranged in a specific order to form a 4-digit number. Since the specific mapping is missing, and the example output is a sequence of digits, it suggests a direct lookup is intended. As I cannot perform this lookup, I will state that the answer requires the missing table. If I were to guess based on a hypothetical ordering, it would be speculative. However, the problem explicitly asks to 'Fill in the table, in the answer blank, transfer the sequence of four digits.' This implies that the numbers associated with B4, B5, B6, and B8 when placed in a sequence will form the answer. Without the table, a definitive answer cannot be provided. For the purpose of generating a JSON, and acknowledging the missing information, I must state this limitation. If this were a real-time interactive task, I would prompt for the table. Since I must provide a JSON, and the question requires a sequence of 4 digits derived from mapping B4, B5, B6, B8 to numbers, I cannot provide a concrete answer. However, if this is a test of understanding the *concept* of mapping and sequence, and I am forced to output *something* in the expected format, it would be a placeholder for the missing data. Let's assume, for the sake of example generation, that the numbers are meant to be derived from their position in a sequence where B4 corresponds to some digit, B5 to another, B6 to a third, and B8 to a fourth, and the question wants this sequence. Since no numbers are provided, I cannot proceed. If I were to interpret the task as a typical school problem where a table is usually provided, and the numbers are simply identifiers, the answer would be a 4-digit number. Given the constraints, and the lack of data, I cannot provide a factual answer. The provided image only shows the question and a partial table header. A table with the dimensions or numerical assignments for B4, B5, B6, and B8 is missing. Therefore, I cannot establish the correspondence and fill in the sequence of four digits.