So, I'm trying to solve a question about a TTL Gate, but I'm kinda stuck. I have this circuit: And I only have to answer if the diodes and transistors are ON or OFF. But I'm not sure what T3's behaviour would be when, let's say, e1 is low and e2 is high, since both T1 and T2 are connected to T3. Can somebody help me, please? Thanks in advance.