How many equivalent Lewis structures are necessary to describe the bonding in PO(OH)3?

How many equivalent Lewis structures are necessary to describe the bonding in PO(OH)3?
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In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures (or forms, also variously known as resonance structures or canonical structures) into a resonance hybrid (or hybrid structure) in valence bond theory
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