data partition A RBSP indicate the presence of any syntax elements of category 4 in the slice data for a slice, a slice data partition C RBSP shall be present having the same value of slice id and redundant pic as in the slice data partition A RBSP. Otherwise (the syntax elements of a slice data partition A RBSP do not indicate the presence of any syntax elements of category 4 in the slice data for a slice), no slice data partition C RBSP shall be present having the same value of slice_id and redundant pic as in the slice data partition A RBSP. 7.4.2.10 RBSP slice trailing bits semantics cabac_zero_word is a byte-aligned sequence of two bytes equal to 0x0000. Let NumBytesInVcINALunits be the sum of the values of NumBytesInNALunit for all VCL NAL units of a coded picture. Let BinCountsInNALunits be the number of times that the parsing process function DecodeBin(), specified in clause 9.3.3.2, is invoked to decode the contents of all VCL NAL units of a coded picture. When entropy_coding_mode_flag is equal to 1, it is a requirement of bitstream conformance that BinCountsInNALunits shall not exceed (32 + 3 ) * NumBytesInVcINALunits + (RawMbBits * PicSizeInMbs / 32. NOTE - The constraint on the maximum number of bins resulting from decoding the contents of the slice layer NAL units can be met by inserting a number of cabac_zero word syntax elements to increase the value of NumBytesInVcINALunits. Each cabac_zero_word is represented in a NAL unit by the three-byte sequence 0x000003 (as a result of the constraints on NAL unit contents that result in requiring inclusion of an emulation_prevention_three_byte for each cabac_zero_word). 7.4.2.11 RBSP trailing bits semantics rbsp_stop_one_bit shall be equal to 1. rbsp_alignment_zero_bit shall be equal to 0. 7.4.2.12 Prefix NAL unit RBSP semantics The content of the prefix NAL unit RBSP is dependent on the value of svc_extension_flag. 7.4.2.13 Slice layer extension RBSP semantics The content of the slice layer extension RBSP is dependent on the value of svc_extension_flag. Cod