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B. Receiving
Test to be sent:
T.R.I. text
Repeat Run T.R.I. text
End of T.R.I. Transmission text
ACK ACK
Send Send
Block end (BCC)
Initial Start
Condition of Transmission text
Text
Text end (BCC)
NAK NAK
Send Send
1st time: receiving the same block
2nd time: receiving the next block
1st time: receiving the same text
2nd time: return to initial condition