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There
was
a
demon
that
lived
in
the
air.
They
said
whoever
challenged
him
would
die.
Their
controls
would
freeze
up,
their
planes
would
buffet
wildly,
and
they
would
disintegrate.
The
demon
lived
at
Mach
1
on
the
meter,
seven
hundred
and
fifty
miles
an
hour,
where
the
air
could
no
longer
move
out
of
the
way.
He
lived
behind
a
barrier
through
which
they
said
no
man
could
ever
pass.
They
called
it
the
sound
barrier.
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