[O] set TO as a property on a heading

[John Kitchin]

I feel a little silly asking this, but I cannot figure out how to do
it. I want to create a property called TO. 

Normally I type C-c C-x p to set a property. When I type TO, the
minibuffer tries to autocomplete to many things other than TO, and I
cannot figure out how to cancel the rest and use TO. In file completion
it is something like C-f, is there something similar for this scenario?

Thanks,

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John Kitchin