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A
problem
in
communication
is
that
people
don't
smile
enough.
Watch
them
on
the
street,
at
the
office
or
even
at
home.
How
often
do
they
smile?
Some
turn
a
smile
on
and
off
like
a
switch
and
use
it
to
impress
others.
But
their
insincerity
is
quite
obvious
to
the
onlooker.
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