Where does the O-O-H come from in this hydroboration-oxidation mechanism?

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Lo.Lee.Ta.
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I cannot for the life of me figure out where the O-O-H comes from that got added in the
3rd step! :confused:

Here's image of the reaction mechanism:

boricacid.jpg


The H2O is not used until the last step and the H2O2 has already been used (except for the H+), so the other O that adds to the OH- to form O-O-H must be coming from the NaOH when it dissociates into Na+ and OH-...
But this would not make sense because we would have an OH- and an O- adding together, and that would be too many electrons! :confused:

Thank you so much! :)
 
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There is more of H2O2 from where it came from.
 
Oh! Okay! I thought that there could only be one molecule of H2O and H2O2 and NaOH because that is what is shown on the reaction arrow.
But, I guess, that only shows what is being used...not the quantities of each...

Thank you! :)