Q.Four silicon diodes $D_1$-$D_4$ and a resistor are connected as shown in the figure (points A, B, C, D, E, F, with a source across the network). Each diode has a resistance of 1 $\Omega$. The exact arrangement of the four diodes and the resistor values printed in the source scan (which shows both a '10 $\Omega$' and an '18 $\Omega$' resistor without a clear circuit topology tying them together) could not be verbatim-transcribed with confidence -- held rather than guessed.