Indicates the line number in the transcript
entry ::= base_number | annotation_number base_number ::= <An integer value between 1 and N, where N is the number of lines> annotation_number ::= <A decimal value between 0 and N+1, where N is the number of lines>
Any non-zero integer or decimal with at most one digit to the right of the decimal
Must be greater than the previously recorded Line value by no more than 1.
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