The logic sources are, from top to bottom, A, B, C, and RST.
Q outputs match the parallel logic sources, so the outputs are, from top to bottom, QA, QB, and QC.
The truth table is below:
A B C RST QA QB QC
0 0 0 0 Hold Hold Hold
1 0 0 0 1 0 0
0 1 0 0 0 1 0
1 1 0 X 0 0 0
0 0 1 0 0 0 1
1 0 1 X 0 0 0
0 1 1 X 0 0 0
1 1 1 X 0 0 0
X X X 1 0 0 0
(X means irrelevant)
