`O larr overset(H)overset(|)UNDERSET(H)underset(|)P-OH``H-O-underset(O)underset(darr)P=O``H-O-underset(H)underset(|)underset(O)underset(|)overset(O)overset(UARR)P-OH``Olarrunderset(H)underset(|)underset(O)underset(|)overset(H)overset(|)P-OH`
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