Identify the main operator in the following propositions. Highlight the main operator using the RED font color. These 4 problems are worth 5 points each:
1.-[-LV-)-> --M))-
2. -I(H & -L) & -B] -> --Y & -K)
3. -I-(P& -Q)]-[-((RvB) ->-S)]
4.-|--Fv) v (-MV-E)-(-(-C & -L))
