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

Lo.Lee.Ta.

I cannot for the life of me figure out where the O-O-H comes from that got added in the
3rd step!

Here's image of the reaction mechanism:



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!

Thank you so much! :)

AGNuke

There is more of H₂O₂ from where it came from.

Lo.Lee.Ta.

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! :)