{HEAD ~ The acts} described with reference to block 37 ensure that each of {TAIL ~ the reformatted packets} has a size that is within an upper bound, and thus ensure that the CBR or near CBR representation does not exceed a maximum bit rate 
{ HEAD ~ The acts } described with reference to block 37 ensure that each of { TAIL ~ the reformatted packets } has a size that is within an upper bound , and thus ensure that the CBR or near CBR representation does not exceed a maximum bit rate
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