It's a hard rebus to do and the rebus is: 3 "that"s
that that that
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My guess is...
"That's all right."
I thought there was a phrase
It’s all that
but couldn’t find a link at short notice. I did find the following show, though:
And now that we’ve come to the end of this answer,
That’s all, folks.
PS: from the horse’s mouth,