For a block that may be designated for implementation in {HEAD ~ either software} or hardware, the block may have a specification in block specifications 504 that is {TAIL ~ either a specification} in a general purpose programming language or a specification in a hardware description language 
For a block that may be designated for implementation in { HEAD ~ either software } or hardware , the block may have a specification in block specifications 504 that is { TAIL ~ either a specification } in a general purpose programming language or a specification in a hardware description language
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