Assertion: computer keyboard's key | /r/AtLocation | typewriter
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Source sentences:
text: So one could have insert mode and overstrike mode both turned on - and either insert when one used the cursor left key (a key typically found on electronic computer terminals, which could insert) or overstrike when one used the backspace key (found on typewriters, which can do naught but overstrike) or replace by using the "rub out" or "delete" key, nicely located below the right shift key, like the correction key on an IBM Selectric II typewriter.