This is a simple flip-flop gate, R & S being for input and Q for output. However I do not understand, what the input would be for the second input on the first pass for each NAND gate. For example, say the first input is 1 1, so 1 into R and 1 into S. What about that second input that flows into each NAND gate??? I understand that after the second pass onwards the second input come from the ouput of the other gate. But what about that first pass of 1 1, is there a default value of 0 if there in no input? thankyou for any help in understanding this matter.