The distribution is bimodal. That is all there is to it.
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They are both modal classes - the distribution is bi-modal.
When observations are grouped into class intervals, the interval that contains the most frequently occurring value is known as the modal class.
It is the class interval with most number of observations.
You cannot have a preceding class to the first class. There is no zeroth class.
It is simply a distribution which has two modal classes: you cannot convert two of them into a mode.