Write the cell diagram for MnO$2($s$)/$Mn$^2+($aq$)($E$0=+1\mathrm{.}23$V$)$ and Hg$2^2+($aq$)/$Hg$($l$)$

$($E$0=+0\mathrm{.}79$V$).($Hint: predict what is the anode and the cathode based on the

standard potentials$)$