What does the following program segment output?

for $)=0$;$m<mi\; id="EditorElement\_1625262">(</mi><mn\; id="EditorElement\_1625244">4</mn>$;$++m$;

for $)=0$;$n<mi\; id="EditorElement\_1625204">(</mi><mn\; id="EditorElement\_1625186">2</mn>$;$++n$;

System.out.print $($m $+""+n+")$ ;

a$.000110112021=31$

b$.010211122122$

c$.42$

d$.31$