sometimes a person who is speaking gets interrupted while speaking. the method through which this is done is incompatible with setting text to instantly appear. as it causes the partial line of dialog to be instantly skipped. You should wait for player to click through to the next line even on an interrupted line, and indicate the interruption in some other way. such as with a - happening mid word
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there is no history button on the gui. so if you miss a line you can't easily look up what it was