Solution:

o-xylene has two reverberation structures, which are as per the following:

Each of the three items are gotten from two Kekule constructions of o-xylene, i.e., methyl glyoxal, 1, 2-demethylglyoxal, and glyoxal. As each of the three items can not be gotten from both of the two constructions, this demonstrates that o-xylene is a reverberation half and half of two Kekule (I and II) structures.