lause 7.3.5.3.2 returns the trailing ones derived from coeff_token. coeff token specifies the total number of non-zero transform coefficient levels and the number of trailing one transform coefficient levels in a transform coefficient level scan. A trailing one transform coefficient level is one of up to three consecutive non-zero transform coefficient levels having an absolute value equal to 1 at the end of a scan of non-zero transform coefficient levels. The range of coeff_token is specified in clause 9.2.1. trailing_ones_sign_flag specifies the sign of a trailing one transform coefficient level as follows: If trailing_ones_sign_flag is equal to 0, the corresponding transform coefficient level is decoded as +1. Otherwise (trailing_ones_sign_flage equal to 1), the corresponding transform coefficient level is decoded as -1. level_prefix and level suffix specify the value of a non-zero transform coefficient level. The range of level_prefix and level_suffix is specified in clause 9.2.2. total_zeros specifies the total number of zero-valued transform coefficient levels that are located before the position of the last non-zero transform coefficient level in a scan of transform coefficient levels. The range of total_zeros is specified in clause 9.2.3. run_before specifies the number of consecutive transform coefficient levels in the scan with zero value before a non-zero valued transform coefficient level. The range of run_before is specified in clause 9.2.3. coeffLevel contains maxNumCoeff transform coefficient levels for the current list of transform coefficient levels. 7.4.5.3.3 Residual block CABAC semantics coded_block_flag specifies whether the transform block contains non-zero transform coefficient levels as follows: If coded_block_flag is equal to 0, the transform block contains no non-zero transform coefficient levels. Otherwise (coded_block_flag is equal to 1), the transform block contains at least one non-zero transform coefficient level. When coded_block_flag is not present, it shall be inferred to be equa