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(5) Case 5 (Abnormal Case 2)
AU2700/5400
A
Host
NAK
B
<T3
<T2
t3<<T4 T6< t3<<T4 t1<
(6) Case 6 (Abnormal Case 3)
t4< t2<<T7 t4< t1<<T1
(7) Case 7 (Abnormal Case 4)
t4< t2<<T7 t4< T5<