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NuPrl is a
formal tool that can manipulate formal specifications. Both the programmer of a protocol layer,
as well as a NuPrl expert are necessary to do the manipulations. An example of a CCP is “the sequence
number on the incoming message is the one that is expected”. In other words, the common case is that no
messages are lost, re-ordered, or duplicated. Other examples are:
“the message is a data message”, “the message is not fragmented”, etc.
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