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==== Delay faults ====
Delay faults can be calassified as:
* Gate delay fault
* Transition fault
* Path delay fault: This fault is due to the sum of all gate propagation delays along a single path. one major problem is the number of possible paths in a circuit under test (CUT), which in the worst case can grow exponentially with the number of lines ''n'' in the circuit.
== Combinational ATPG ==
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