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By this simple change, we can avoid printing all controls except \c?.
On ASCII platforms the remaining control is DEL, which is handled above.
On EBCDIC platforms, \c? remains a problem.
But it isn't clear what to do about this anyway, as the module
interprets ^D, ^H, ^U specially as if they were typed from the keyboard,
and expects the keyboard to transmit them in a particular way, which may
not be valid for EBCDIC. No tests fail, so fixing this will have to
wait for tuits or field complaints.
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